#Chondrites
The most common meteorites: primitive stony rocks full of chondrules from the birth of the Solar System.
Lessons (18)
- Achondrites: rocks from melted worldsAchondrites are stony meteorites without chondrules. They come from worlds that melted, and many of them look surprisingly like volcanic roc
- Carbonaceous chondritesCarbonaceous chondrites are rare, often dark and crumbly, and scientifically priceless.
- Chondrites: the oldest rocksChondrites are the most common meteorites of all, and some of the most important rocks in science.
- Classifying a new meteoriteThis final lesson brings the course together, following a new meteorite from arrival at the laboratory to an approved name in the Meteoritic
- Early Solar System chronologyMeteorites let us build a timeline of the first few million years of the Solar System with a precision that seems almost impossible. Here is
- Enstatite chondrites and other rare classesBeyond ordinary and carbonaceous chondrites lie smaller classes formed in very different chemical conditions. They show how varied the early
- How meteorites get their namesEvery officially recognised meteorite has a unique name. Learning how names work helps you read any meteorite label or catalogue.
- Identifying a possible meteoriteMost suspected meteorites turn out to be Earth rocks. This lesson sets out a careful, non-destructive approach, and explains what only a lab
- Delivery: from asteroid families to EarthWhich asteroids are our meteorites actually coming from? Dynamics, spectroscopy and exposure ages are converging on answers.
- Ordinary chondrites: H, L and LLRoughly four in every five meteorites seen to fall are ordinary chondrites. They are divided into three groups, H, L and LL, and learning to
- Oxygen isotopes: the fingerprint of originOxygen makes up nearly half of most rocks by mass, and its three stable isotopes carry a signature that distinguishes parent bodies.
- Petrologic types: from wet to hotThe number after a chondrite's group letter, as in H5 or CM2, is its petrologic type. It tells you what happened to the rock inside its
- Primitive achondrites and ureilitesBetween chondrites and fully melted achondrites lie rocks caught in the act of melting. They reveal how differentiation begins.
- Sample return: ground truth for meteoriticsSamples collected directly from known bodies test the links that meteoriticists have proposed for decades, and reveal what meteorites alone
- Shock and weathering gradesClassification codes often end with an S and a W number, as in L6 S4 W1. These record what impacts did to the rock in space, and what Earth
- The classification frameworkMeteorite classification is a hierarchy built on petrology, bulk chemistry and isotopes.
- The NC–CC isotopic dichotomyNucleosynthetic isotope anomalies split meteorites into two great families that formed in separate regions of the disc.
- Three kinds of meteoriteMeteorites come in three big families: stony, iron and stony-iron. Each one tells a different story about the asteroid it came from.
Courses (15)
- Extinct radionuclides and the first few million yearsSome radioactive isotopes present when the Solar System formed have long since decayed away.
- Igneous petrology of meteoritesMelting and crystallisation on asteroids, the Moon and Mars produced igneous rocks that geologists read with the same tools used on Earth.
- Mass spectrometry and oxygen isotopesMass spectrometers measure isotope ratios to within about ten parts per million. Oxygen's three isotopes then sort meteorites into famil
- Spectroscopy: matching meteorites to asteroidsSunlight reflected from an asteroid carries the absorption fingerprints of its minerals.
- Chondrites and the birth of the Solar SystemChondrites are the least changed rocks we have. Their components formed in the disc around the young Sun and date the start of the Solar Sys
- How meteorites are classifiedTens of thousands of meteorites are sorted into a system of classes and groups. This lesson explains the main branches and what the labels o
- Identifying a possible meteoriteMost rocks people suspect are meteorites turn out to be Earth rocks or industrial slag.
- Water and the ingredients of lifeSome meteorites carry water locked in minerals and a rich chemistry of carbon compounds, including amino acids and nucleobases.
- Adult course: Meteorites from first principlesTwelve lessons for adult learners: where meteorites come from, how falls are tracked and recovered, how they are classified and dated, what
- Earth's early atmosphere and oceansWhere did Earth's air and water come from? Volcanoes released gases, and meteorites show that asteroids may also have delivered water.
- How the Solar System formedThe Sun and planets formed from a cloud of gas and dust about 4.6 billion years ago.
- Three kinds of meteoriteScientists sort meteorites into three main kinds by what they are made of: stone, iron, or a mixture of both.
- Density: a test you can measureMeteorites are usually denser than Earth rocks of the same size. In this lesson you will calculate density, measure volume by displacement a
- Elements, compounds and mixtures in meteoritesMeteorites are made of the same chemical elements as Earth, combined in the same ways.
- Meteorites and the rock cycleGeologists sort Earth rocks into igneous, sedimentary and metamorphic. Meteorites can be described in the same way, which tells us what happ
Books (4)
- Meteorite Classification: The Professional's GuideA working reference for classifiers, curators and postgraduate researchers. It sets out current practice for every meteorite type: the fifte
- The Meteorite Collector's HandbookA meteorite collection can hold pieces of asteroids, Vesta, the Moon and Mars. This handbook explains every major class, from ordinary chond
- Meteorites ExplainedThe oldest solids in meteorites formed 4,567 million years ago, before any planet. Meteorites Explained shows how scientists know: from the
- Meteoritics for StudentsMeteorites are the oldest rocks we can hold, and reading them uses nuclear physics, chemistry, geology and orbital mechanics. This guide run
Famous meteorites (32)
- AbeeA 107-kilogram enstatite chondrite that fell on a Canadian wheat field in 1952 – a rare sample of rock formed with almost no oxygen.
- AllendeThe meteorite that fell on a Mexican village months before Apollo 11 – and turned out to hold the oldest solids in the Solar System.
- BarwellOn Christmas Eve 1965 a shower of stones fell on a Leicestershire village, the largest meteorite fall recorded in Britain.
- BenešovA fireball photographed over the Czech Republic in 1991 whose meteorites were found only 20 years later – and turned out to be a mixture of
- BjurböleA meteorite that crashed through sea ice in Finland in 1899 and is so crumbly that its chondrules fall out like marbles.
- CarancasIn 2007 a stony meteorite blasted a crater near Lake Titicaca – something scientists had not expected a rock its size to do.
- ChelyabinskThe 2013 airburst over Russia that shattered thousands of windows and reminded the world that asteroid impacts still happen.
- EnsisheimThe stone that fell on Alsace in 1492 is the oldest European meteorite with a known fall date that still survives.
- Gao-GuenieA shower of stones over Burkina Faso in 1960 that became one of the most widely distributed meteorites in the world.
- HolbrookIn 1912 thousands of stones rained down near a railway station in the Arizona desert – and people are still finding them.
- JilinIn 1976 a meteorite shower over north-east China included a single stone of about 1,770 kilograms – the largest stony meteorite ever seen to
- JuvinasA single basaltic stone that fell in southern France in 1821 and helped show that some asteroids once had volcanoes.
- KaidunA small stone that fell on a military base in Yemen in 1980 and turned out to be a jigsaw of many different worlds.
- KapoetaA howardite that fell in South Sudan in 1942 – a piece of the battered surface of the asteroid Vesta.
- KošiceA 2010 fireball over Slovakia caught on security cameras, whose recovered stones were traced back to their orbit in space.
- L'AigleThe 1803 shower of stones in Normandy that finally convinced scientists rocks really do fall from the sky. Today it seems obvious that rocks
- MbaleIn 1992 hundreds of stones rained on a town in eastern Uganda – and one small piece bounced off a banana tree onto a boy's head.
- MillbillillieA eucrite that fell in the Western Australian outback in 1960, famous for its glossy black fusion crust.
- MurchisonA stone that fell on an Australian town in 1969, packed with the chemical building blocks of life.
- Norton CountyA shower of pale, almost iron-free stones over the Kansas–Nebraska border in 1948, including the largest aubrite ever found.
- OrgueilA crumbly black meteorite from 1864 whose chemistry is the closest match on Earth to the Sun itself.
- OzerkiA bright fireball over Russia in June 2018 that delivered fresh stones to villagers and scientists within days.
- PeekskillThe 1992 fireball filmed by football fans across the eastern United States that ended up in the boot of a parked car.
- PultuskIn 1868 a fireball over Poland released one of the largest showers of stones ever recorded – tens of thousands of them.
- StannernA shower of basaltic stones that fell on Moravia in 1808 and gave its name to a distinctive kind of lava from Vesta.
- Sutter's MillIn 2012 a rare carbon-rich meteorite fell on the very spot where the California Gold Rush began – and weather radar helped find it.
- SylacaugaIn 1954 a meteorite crashed through a roof in Alabama and struck Ann Hodges – the first well-documented person hit by a meteorite.
- Tagish LakeA fragile carbon-rich meteorite that fell onto a frozen Canadian lake in 2000 and was collected without being touched by bare hands.
- TatahouineA meteorite that shattered into green crystals in the Tunisian desert in 1931 – a fragment from deep inside the asteroid Vesta.
- WestonThe 1807 Connecticut fall investigated by two Yale professors – the first meteorite fall in the Americas to be studied scientifically.
- WinchcombeThe 2021 fireball filmed across Britain that delivered the UK's first carbonaceous chondrite – onto a family's driveway.
- Wold CottageEngland's largest single meteorite landed beside a Yorkshire ploughman in 1795 – and helped prove that stones fall from the sky.
Meteorite types (48)
- AcapulcoitesFine-grained rocks that only just began to melt. Named after Acapulco in Mexico, which fell in 1976, acapulcoites are fine-grained rocks of
- AchondritesIgneous stones from bodies that melted: asteroids, the Moon and Mars. An achondrite is a stony meteorite without chondrules.
- AngritesThe oldest volcanic rocks known, from a vanished early planetesimal. Named after Angra dos Reis in Brazil, which fell in 1869, angrites are
- Asteroidal achondritesFully melted, differentiated rocks from the crusts and mantles of asteroids, Vesta above all.
- AubritesPale, almost iron-free rocks made of enstatite, from an extremely oxygen-poor world.
- BrachinitesOlivine-rich rocks from an asteroid whose melt drained away. Named after Brachina in South Australia, brachinites are made mostly of iron-ri
- Carbonaceous chondritesRare, often dark chondrites rich in carbon, water-bearing minerals and organic compounds, including the building blocks of life.
- CB chondrites (bencubbinites)More than half metal, with chondrules made in a planet-sized collision. CB chondrites, named after Bencubbin in Australia, are more than 50%
- CH chondrites'High metal' carbonaceous chondrites with tiny chondrules. CH chondrites are rich in iron-nickel metal, about 20% of the rock by vol
- ChassignitesOlivine-rich Martian rocks; the first known fell in France in 1815. Chassignites are dunites, rocks made almost entirely of olivine, that fo
- ChondritesPrimitive stones that never melted, made of the first solids of the Solar System. The most common meteorites of all.
- CI chondritesThe chemically most primitive rocks known: their make-up matches the Sun's. CI chondrites, named after Ivuna in Tanzania, match the comp
- CK chondritesHeated, highly oxidised carbonaceous chondrites, cousins of the CVs. CK chondrites, named after Karoonda in Australia, are unusual among car
- CM chondritesWater-rich carbonaceous chondrites full of organic molecules, Murchison and Winchcombe among them.
- CO chondritesSmall-chondrule carbonaceous chondrites, close relatives of the CMs. CO chondrites, named after Ornans in France, have very small chondrules
- CR chondritesMetal-bearing carbonaceous chondrites with some of the most pristine organic matter known.
- CV chondritesLarge chondrules and big white inclusions, the oldest solids in the Solar System. Allende is the classic.
- DiogenitesPyroxene-rich rocks from deep inside Vesta. Diogenites are coarse-grained rocks made mostly of orthopyroxene, sometimes with olivine.
- Eagle Station pallasitesA tiny grouplet of pallasites with iron-rich olivine and nickel-rich metal, from a separate parent body.
- EH chondritesHigh-iron enstatite chondrites. EH chondrites have more metal and smaller chondrules than EL chondrites, and contain niningerite, a magnesiu
- EL chondritesLow-iron enstatite chondrites. EL chondrites have less metal than EH chondrites and contain alabandite, a manganese sulphide, instead of nin
- Enstatite chondritesChondrites formed with almost no oxygen to spare, full of rare minerals unknown on Earth's surface.
- EucritesVolcanic basalt from the crust of Vesta. Eucrites are basalts and gabbros from Vesta's crust, made mainly of pigeonite (a calcium-poor p
- H chondritesHigh-iron ordinary chondrites: about a third of all meteorites seen to fall. H chondrites have the highest total iron of the ordinary chondr
- HED meteorites: pieces of VestaThe howardites, eucrites and diogenites: crust and mantle rocks from the giant asteroid 4 Vesta. The meteorites this site is named after.
- HowarditesBroken rubble from the surface of asteroid Vesta, mixing crust and mantle rocks. Howardites are regolith breccias: rocks made from the broke
- IIE ironsIrons full of silicate fragments, possibly from asteroid Hebe. IIE irons are octahedrites of varying coarseness that often contain silicate
- K chondrites (Kakangari grouplet)A tiny grouplet with a mix of features found in no other chondrite group. K chondrites are named after Kakangari in India, which fell in 189
- L chondritesLow-iron ordinary chondrites: the single most common group of meteorites. L chondrites have less metal than H chondrites, typically 4% to 10
- LL chondritesLow iron, low metal: the ordinary chondrites matched to asteroid Itokawa. LL chondrites have the least metal of the ordinary chondrites, onl
- LodranitesCoarse-grained leftovers after melt drained away. Named after Lodran in Pakistan, which fell in 1868, lodranites are coarser-grained than ac
- Lunar basalts and gabbrosDark volcanic rock from the lunar maria, the Moon's great lava plains. Lunar basalts are pieces of the dark lava plains, the maria, that
- Feldspathic lunar meteoritesPale breccias from the ancient lunar highlands, the most common kind of Moon rock to reach Earth.
- Lunar meteoritesRocks from the Moon, found mainly in deserts and Antarctica. Lunar meteorites are pieces of the Moon blasted off by impacts.
- Mingled lunar brecciasBreccias that mix highland and mare rock, from the borders between the two. Mingled breccias contain both pale highland material and dark ma
- Martian meteoritesRocks from Mars, recognised by gas from the Martian atmosphere trapped inside them.
- ALH 84001 and other Martian rocksThe ancient Martian rock once claimed to hold fossils, and 'Black Beauty'. Allan Hills 84001, found in Antarctica in December 1984,
- MesosideritesJumbled breccias of metal and basalt, made in a violent collision. Mesosiderites are breccias of roughly equal parts iron-nickel metal and s
- NakhlitesAugite-rich volcanic rocks from Mars, about 1.3 billion years old. Nakhlites, named after Nakhla in Egypt (fell 1911), are made mainly of au
- Ordinary chondritesThe everyday meteorite: four in every five falls. Three groups, H, L and LL, from at least three asteroids.
- Planetary achondritesRocks knocked off the Moon and Mars by impacts. A few achondrites come not from asteroids but from much larger worlds.
- Primitive achondritesRocks that began to melt but were never fully processed: halfway between chondrites and igneous rocks.
- R chondrites (rumurutiites)Highly oxidised chondrites with almost no metal. R chondrites are named after Rumuruti in Kenya, the only one seen to fall (1934).
- ShergottitesThe most common Martian meteorites: young basaltic and olivine-rich rocks. Shergottites, named after Shergotty in India (fell 1865), make up
- Stony meteoritesMeteorites made mostly of silicate minerals. They are by far the most common kind seen to fall.
- Ungrouped achondritesMelted rocks that match no known group: each may be the only sample of its own world. Some achondrites fit none of the named groups.
- UreilitesCarbon-rich rocks with diamonds, from an asteroid shattered by a giant impact. One was tracked in space before it hit Earth.
- WinonaitesPrimitive achondrites related to the silicate inclusions in IAB irons. Named after the Winona meteorite, found buried in a Sinagua ruin in A
Space missions (6)
- HayabusaThe first asteroid sample ever returned, which proved where ordinary chondrites come from.
- Hayabusa2Pieces of a carbon-rich asteroid that turned out to be the purest primitive rock ever studied. Hayabusa2 reached the asteroid Ryugu in June
- HeraEurope's detective mission to study the asteroid moon that DART struck. DART showed that an asteroid can be nudged, but telescopes on Ea
- MMX (Martian Moons eXploration)Japan's mission to bring back the first sample from a moon of Mars. Mars has two small, dark moons, Phobos, about 22 kilometres across,
- NEAR ShoemakerThe first spacecraft to orbit an asteroid, and the first to land on one. NEAR, the Near Earth Asteroid Rendezvous mission, was the first spa
- OSIRIS-RExThe largest asteroid sample ever returned, full of salts, water-formed minerals and life's building blocks.
Meteorite minerals (67)
- AkimotoiteA high-pressure form of pyroxene with the ilmenite structure, formed in shocked meteorites.
- AlbiteSodium-rich plagioclase feldspar, which grows in ordinary chondrites as they are heated inside their parent asteroids.
- AndraditeA calcium–iron garnet that grew during alteration in CV chondrites such as Allende.
- AragoniteA second form of calcium carbonate, found in some CM chondrites. Aragonite has the same chemistry as calcite but a denser structure.
- AsimowiteThe iron-rich partner of wadsleyite: a dense form of fayalite made by shock. Asimowite has the structure of wadsleyite, the high-pressure fo
- AwaruiteA nickel-rich iron alloy found in some oxidised carbonaceous chondrites. Awaruite is an alloy with about three nickel atoms for each iron at
- BrearleyiteA chlorine-bearing calcium aluminate formed when fluids altered an ancient inclusion.
- BridgmaniteThe most abundant mineral inside Earth, found and named only thanks to a shocked meteorite.
- CalciteCalcium carbonate that grew from water inside carbonaceous asteroids, and also forms as meteorites weather on Earth.
- ChlorapatiteA chlorine-bearing calcium phosphate in ordinary chondrites, and a record of water and gas in their parent bodies.
- ChromiteA black iron–chromium oxide found in almost every stony meteorite, and the survivor that reveals fossil meteorites.
- Native copperTiny grains of pure copper found next to troilite and metal in ordinary chondrites. Native copper is the element copper in metallic form.
- CronstedtiteAn iron-rich serpentine mineral typical of the least altered CM chondrites. Cronstedtite is a member of the serpentine group in which iron,
- DiopsideA calcium–magnesium pyroxene found in the oldest solids of the Solar System and in many chondrules.
- DjerfisheriteA potassium-bearing sulphide with chlorine, found in enstatite chondrites. Djerfisherite is a complex sulphide of potassium, iron, copper an
- DmitryivanoviteA dense form of calcium aluminate found in the oldest inclusions of carbonaceous chondrites.
- DolomiteA calcium magnesium carbonate common in CI chondrites and in the Ryugu and Bennu samples.
- ElgoresyiteA dense magnesium–iron silicate with an unusual ratio of metal to silicon, found in a shock vein of the Suizhou chondrite.
- EnstatiteThe magnesium pyroxene that dominates enstatite chondrites and aubrites, and many chondrules.
- EpsomiteEpsom salt, a magnesium sulphate that crystallises on CI chondrites in collections. Epsomite is magnesium sulphate with seven water molecule
- FerrihydriteA poorly crystalline iron oxyhydroxide found in the matrix of CI chondrites. Ferrihydrite is a hydrous iron oxide with very small, poorly or
- ForsteriteThe magnesium-rich end of the olivine series, the olivine of primitive chondrules and the oldest Solar System grains.
- GrossiteA calcium aluminium oxide found in rare, extremely refractory inclusions in CH and CR chondrites.
- GrossmaniteA pyroxene containing titanium in an unusual state, found in the oldest inclusions in Allende.
- GypsumA calcium sulphate found in white veins in CI chondrites, partly grown after they reached Earth. Gypsum is a soft, water-bearing sulphate of
- HaliteRock salt, found as purple crystals with trapped water in two ordinary chondrites and as salts in the Bennu sample. Halite is sodium chlorid
- HaxoniteA nickel-rich iron carbide found in iron meteorites and some chondrites. Haxonite is a carbide containing more nickel and less carbon than c
- HedenbergiteThe iron-rich calcium pyroxene, which grew in carbonaceous chondrites as fluids altered the rock.
- HemleyiteThe iron-rich form of akimotoite: pyroxene composition packed into the ilmenite structure by shock.
- Hibonite-(Fe)An iron-rich hibonite that formed when an ancient inclusion in Allende was altered.
- HiroseiteThe iron-rich partner of bridgmanite: pyroxene composition in the perovskite structure.
- KamaciteLow-nickel iron metal, the main mineral of most iron meteorites and the metal flecks in chondrites.
- KeiliteAn iron-rich magnesium sulphide that grew from niningerite during impacts on enstatite chondrites.
- KrotiteA calcium aluminium oxide found in an unusual refractory inclusion, until then known only from cement.
- KushiroiteAn aluminium-rich pyroxene, long known only from laboratory experiments, found in refractory inclusions.
- LinguniteThe dense hollandite-structured form of feldspar, found in shock veins of chondrites.
- MagnetiteThe strongly magnetic iron oxide that grew in water inside carbonaceous asteroids and forms the crust of cosmic spherules.
- MajindeiteA magnesium molybdenum oxide formed when tiny metal nuggets in Allende were oxidised.
- MajoriteA garnet made from pyroxene at high pressure, in which silicon takes an unusual place.
- MeliliteA calcium aluminium silicate series, gehlenite to åkermanite, that makes up much of the white inclusions in Allende.
- MerrihueiteAn iron-rich osumilite-group silicate found in a primitive ordinary chondrite. Merrihueite is the iron- and potassium-rich partner of roedde
- NephelineA sodium aluminium silicate that replaces melilite and anorthite in CAIs that were later altered.
- NieriteSilicon nitride, some grains of which are stardust from exploding stars. Nierite is a compound of silicon and nitrogen.
- NiningeriteA magnesium sulphide found only in EH enstatite chondrites. Niningerite is a magnesium–iron sulphide with the same cubic structure as table
- OhtaniiteA wadsleyite-like magnesium silicate with empty sites in its structure, crystallised from a shock melt of pyroxene composition.
- OldhamiteCalcium sulphide, which exists only where there was almost no oxygen, as in enstatite meteorites. Oldhamite is calcium sulphide.
- OlivineThe green magnesium–iron silicate that is the most common mineral in stony meteorites and the gem crystals of pallasites.
- PentlanditeAn iron–nickel sulphide found with pyrrhotite in carbonaceous chondrites. Pentlandite is a sulphide of iron and nickel in roughly equal amou
- PerryiteA nickel silicide-phosphide found in the metal of enstatite chondrites and aubrites. Perryite is a compound of nickel and iron with silicon
- PlagioclaseThe feldspar series from sodium albite to calcium anorthite, the light-coloured mineral of basalts and lunar highlands.
- PoirieriteA rare form of olivine composition, halfway in structure between olivine and its high-pressure forms, found in shock veins of chondrites.
- PyrrhotiteA magnetic iron sulphide with a little less iron than troilite, common in carbonaceous chondrites.
- RingwooditeThe dense, spinel-structured form of olivine, made by shock in meteorites and found deep inside Earth.
- RoedderiteA rare sodium–potassium magnesium silicate of the osumilite group, first found in an enstatite chondrite.
- SaponiteA swelling clay mineral intergrown with serpentine in CI chondrites and in samples from Ryugu and Bennu.
- SerpentineA water-bearing sheet silicate that makes up much of the matrix of CM and CI chondrites.
- Silica minerals: tridymite, cristobalite and quartzSilicon dioxide in its different crystal forms, found in eucrites, enstatite chondrites and lunar basalts. Silica is silicon dioxide.
- SinoiteA silicon oxynitride found in enstatite chondrites. Sinoite is a compound of silicon with nitrogen and oxygen.
- SodaliteA chlorine-bearing sodium aluminium silicate formed by alteration in the CAIs of CV chondrites.
- SylvitePotassium chloride, found with halite in the Monahans and Zag chondrites. Sylvite is potassium chloride, a salt that crystallises from brine
- TochiliniteA layered iron sulphide and hydroxide that forms with serpentine in CM chondrites.
- TuiteThe high-pressure form of the meteorite phosphate merrillite, found in shock veins. Tuite is calcium phosphate with a dense structure.
- WadsleyiteA high-pressure form of olivine, between olivine and ringwoodite, found in shocked meteorites.
- WangdaodeiteA high-pressure form of ilmenite with the lithium niobate structure. Wangdaodeite has the chemistry of ilmenite, iron titanium oxide, but a
- WassoniteA titanium sulphide found as tiny grains in an Antarctic enstatite chondrite. Wassonite is titanium sulphide.
- WollastoniteA calcium silicate found in altered CAIs and chondrules of CV chondrites. Wollastonite is a chain silicate of calcium.
- XieiteA dense, high-pressure form of chromite found in a shocked Chinese chondrite. Xieite has the chemistry of chromite but a denser structure.
Glossary (116)
- Acapulcoite
- Achondrite
- Albite
- Almahata Sitta
- Aluminium-26
- Amino acids
- Amoeboid olivine aggregate
- Angrite
- Aqueous alteration
- Argon–argon dating
- Asteroid family
- Aubrite
- Barred olivine chondrule
- Brachinite
- Bulk composition
- C-type asteroid
- Calcium-aluminium-rich inclusion (CAI)
- Carbonaceous chondrite
- Carbonates
- CB chondrite
- CCAM line
- CH chondrite
- Chemical group
- Chondrite classes
- Chondrite
- Chondrule
- Chromite
- CI chondrite
- CK chondrite
- Clan
- Classification
- CM chondrite
- CO chondrite
- CR chondrite
- Cronstedtite
- Cryptocrystalline chondrule
- Crystallisation
- CV chondrite
- Dark inclusion
- Daubréelite
- Δ17O (cap delta O-17)
- Deuterium-to-hydrogen ratio
- Differentiation
- Diopside
- Dolomite
- EH chondrite
- EL chondrite
- Enstatite chondrite
- Enstatite
- Equilibrated chondrite
- Fayalite content (Fa)
- Fayalite
- Ferrihydrite
- Fine-grained rim
- Forsterite
- Fossil meteorite
- Gas retention age
- Glass
- Grouplet
- Gypsum
- H chondrite
- Hand lens
- Haxonite
- Igneous rock
- IIE irons
- Impact melt breccia
- Isotopic dichotomy
- Itokawa
- Kakangari chondrite
- L chondrite
- LL chondrite
- Lodranite
- Manganese–chromium dating
- Matrix
- Mesostasis
- Metal detector
- Metal flecks
- Niningerite
- Oldhamite
- Ordinary chondrite
- Organic matter
- Oxygen isotopes
- Pentlandite
- Petrologic subtype
- Petrologic type
- Phyllosilicate
- Plagioclase
- Porphyritic chondrule
- Presolar grains
- Primitive achondrite
- Protoplanetary disc
- Pyrrhotite
- R chondrite
- Radial pyroxene chondrule
- Recrystallisation
- Ringwoodite
- Ryugu
- S-type asteroid
- Saponite
- Serpentine
- Shock darkening
- Solar nebula
- Stony meteorite
- Sulfide
- Terrestrial fractionation line
- Thermal metamorphism
- Thermoluminescence
- Thin section
- Tochilinite
- Type I and type II chondrules
- Unequilibrated chondrite
- Ureilite
- Volatile element
- Window
- Winonaite
- Zoning
Questions and answers (78)
- Are all meteorites magnetic?No: most meteorites contain iron-nickel metal and will attract a magnet, but many achondrites, including most Martian, lunar and Vesta meteo
- Are there minerals found only in meteorites?Yes. Hundreds of minerals were first discovered in meteorites, and some, such as oldhamite and schreibersite, are extremely rare or unknown
- Are tiny meteorite fragments worth collecting?Yes. Small fragments and micromounts are affordable, take little space and can represent rare types that would be unaffordable as large spec
- Can a metal detector find stony meteorites?Often yes, because most stony meteorites contain iron-nickel metal grains, but signals are weak and depend on the detector, the stone and th
- Can meteorites tell us what is inside Earth?Yes. Iron meteorites are samples of planetary cores, and chondrites show the raw materials Earth was built from, helping scientists estimate
- Did asteroids ever have magnetic fields?Yes, some did. Studies of meteorites suggest that several early asteroids had molten metal cores that produced magnetic fields, like a small
- Do meteorites contain water?Yes, many do. Most of it is not liquid but locked inside minerals that formed in water, and carbonaceous chondrites can hold over a tenth of
- Do we know which asteroids ordinary chondrites came from?Increasingly, yes. Recent studies link many L chondrites to the Massalia asteroid family and many H chondrites to young families in the Koro
- Does a metal detector help find meteorites?Yes, for iron meteorites and most ordinary chondrites, which contain iron-nickel metal.
- How can I explain chondrules to pupils?Chondrules are tiny once-molten droplets, older than Earth, that make up much of most meteorites; comparing them to frozen raindrops or swee
- How can I make replica meteorites for class activities?Mix plaster or clay with small beads for chondrules and iron filings or steel shot for metal, shape them, and paint the outside black to mod
- How can I show pupils that most meteorites come from asteroids?Use orbits calculated from filmed fireballs, which trace back to the asteroid belt, plus spacecraft samples from asteroids Itokawa, Ryugu an
- How can I teach about water on Earth using meteorites?Some meteorites contain water-bearing minerals and water with hydrogen isotopes similar to Earth's oceans, so pupils can weigh the evide
- How can I teach classification using meteorites?Use sorting tasks and dichotomous keys based on observable features such as metal content, chondrules and crystals, then compare pupils'
- How can I teach meteorites without real specimens?Use high-quality photographs, replicas, everyday analogues, videos, virtual 3D models and hands-on models, and focus on evidence and reasoni
- How can I teach the origin of the Solar System using meteorites?Meteorites record the sequence from dust and the first solids to planetesimals, melting and differentiation, so pupils can build a timeline
- How can I use meteorites to teach the rock cycle?Meteorites show rocks that never went through Earth's rock cycle, which makes them a powerful comparison: igneous, metamorphic and brecc
- How can I use microscopes to study meteorites in class?Use hand lenses or digital microscopes on meteorite slices and photographs of thin sections, so pupils can see chondrules, metal grains and
- How can meteorites be used in A-level geology?Meteorites illustrate igneous and metamorphic petrology, crystallisation, isotope geochemistry and planetary differentiation, and thin secti
- How do I read a meteorite label?A typical label gives the official name, classification, fall or find date, location, mass and source.
- How do meteorites reveal the early Sun's activity?Solar wind gases, solar flare tracks and isotopes made by solar radiation in meteorites record that the young Sun was far more active than t
- How do scientists cut and study a meteorite?They cut meteorites with diamond saws, prepare polished slices and thin sections, and analyse them with microscopes, electron beams and mass
- How do we know which asteroid a meteorite came from?Usually we only know the likely type or region of asteroid, by matching how meteorites and asteroids reflect light, reconstructing fireball
- How hot did the insides of asteroids get?It varied. Some asteroids stayed cool enough for ice to melt but not rock, while others reached 1,000 °C or more and melted completely into
- How long did it take to form the planets?Asteroid-sized bodies formed within about the first few million years, Mars largely within about 10 million years, and Earth over roughly 30
- How many different parent bodies do meteorites come from?Probably more than a hundred. Meteorite groups and ungrouped meteorites suggest dozens of iron meteorite parent bodies alone, plus many more
- How old are Martian meteorites?Most Martian meteorites crystallised between about 150 million and 1.4 billion years ago, but a few are much older, up to about 4.4 billion
- Is a meteorite heavy for its size?Usually, yes: most stony meteorites are denser than common rocks because they contain iron-nickel metal, and iron meteorites are more than t
- Should I grind a window on my rock to look inside?Only after seeking expert advice. Grinding a small window can reveal metal flecks and chondrules, but it permanently alters the specimen.
- What are achondrites?Achondrites are stony meteorites that formed from melted rock, so they lack the chondrules found in chondrites.
- What are HED meteorites and why are they linked to Vesta?HED meteorites are the howardites, eucrites and diogenites, a family of igneous achondrites.
- What are interplanetary dust particles?Interplanetary dust particles are tiny grains collected in Earth's stratosphere by high-flying aircraft; many come from comets and are a
- What are lunar meteorites made of?Most lunar meteorites are breccias of pale highland rock rich in feldspar, while others are dark basalts from the maria or mixtures of both.
- What are meteorites made of?Meteorites are made of the same chemical elements as Earth, mostly as silicate minerals such as olivine and pyroxene, iron-nickel metal and
- What are primitive achondrites?Primitive achondrites are meteorites that were heated enough to partly melt but kept much of their original chondritic chemistry, such as ac
- What are the largest meteorites to fall in Britain?The largest single stone seen to fall in Britain is Wold Cottage (Yorkshire, 1795) at about 25 kg, while the largest total mass from one fal
- What are the main types of meteorite?There are three broad types: stony meteorites, iron meteorites and stony-iron meteorites.
- What can meteorites tell us about the early Solar System?Meteorites act as a time capsule, recording when the first solids formed, how quickly asteroids and planets grew and melted, which stars con
- What do the numbers in a name like L6 or H5 mean?The letter is the chemical group of an ordinary chondrite (H, L or LL, reflecting its iron and metal content), and the number is the petrolo
- What does the classification of a meteorite mean?A meteorite's classification is a short code that tells scientists what kind of rock it is, which group it belongs to and, for many ston
- What does the inside of a meteorite look like?It depends on the type: most stony meteorites are grey inside with metal flecks and tiny round grains, iron meteorites are solid metal that
- What is a brachinite?A brachinite is a rare olivine-rich achondrite, thought to be the residue left after an early asteroid partly melted and lost its basaltic m
- What is a calcium-aluminium-rich inclusion (CAI)?A CAI is a pale inclusion in some chondrites made of high-temperature minerals. CAIs are the oldest solids formed in the Solar System, about
- What is a carbonaceous chondrite?A carbonaceous chondrite is a primitive stony meteorite rich in carbon compounds and often in water-bearing minerals.
- What is a chondrite?A chondrite is a stony meteorite that was never melted after it formed, so it preserves the original mixture of dust and grains from the ear
- What is a chondrule?A chondrule is a small, rounded grain, usually less than a few millimetres across, that formed as a molten droplet floating in space in the
- What is a CM chondrite?A CM chondrite is a carbonaceous chondrite altered by water, rich in clay minerals and organic compounds, such as Murchison and Winchcombe.
- What is a CV chondrite?A CV chondrite is a carbonaceous chondrite with large chondrules and abundant CAIs, such as Allende, the source of many key discoveries abou
- What is a howardite?A howardite is a type of achondrite meteorite made of broken fragments of two kinds of rock, eucrite and diogenite, fused together.
- What is a meteorite slice?A meteorite slice is a thin section cut from a meteorite with a diamond saw and usually polished, revealing internal features such as chondr
- What is a pallasite and how did it form?A pallasite is a stony-iron meteorite of olivine crystals in iron-nickel metal. Most likely formed where core metal and mantle olivine mixed
- What is a planetesimal?A planetesimal is one of the small solid bodies, from about a kilometre to hundreds of kilometres across, that formed in the young Sun's
- What is a regolith breccia and what can it tell us?A regolith breccia is a rock made from the compacted surface soil of an asteroid, the Moon or another airless body, preserving a record of i
- What is a ureilite?A ureilite is an unusual achondrite made of olivine and pyroxene with carbon, including graphite and tiny diamonds, from a parent body shatt
- What is an aubrite?An aubrite is a pale achondrite made almost entirely of iron-free enstatite pyroxene, formed in extremely oxygen-poor conditions.
- What is an enstatite chondrite?An enstatite chondrite is a chondrite made mostly of iron-free enstatite pyroxene, formed in very oxygen-poor conditions, with isotopes simi
- What is an R chondrite?An R chondrite, or Rumuruti chondrite, is a rare, highly oxidised chondrite with abundant iron-rich olivine and almost no metal.
- What is aqueous alteration in meteorites?Aqueous alteration is the change of minerals by liquid water inside asteroids, which turned olivine, pyroxene and metal into clays, carbonat
- What is inside a meteorite?Inside, a meteorite is made of minerals and often shiny bits of metal. Many contain little round grains called chondrules, and some are almo
- What is the Allende meteorite?Allende is a large carbonaceous chondrite that fell in Mexico on 8 February 1969, providing tonnes of material rich in CAIs, the oldest soli
- What is the cosmic-ray exposure age of most meteorites?Most stony meteorites travelled as small bodies for about 1 to 100 million years; iron meteorites typically for hundreds of millions of year
- What is the isotopic dichotomy in meteorites?It is the division of meteorites into two isotopic families, from the inner and outer Solar System, which stayed separate for millions of ye
- What is the Kaidun meteorite?Kaidun is an extraordinary meteorite that fell in Yemen in 1980, containing a mixture of many different meteorite types in one stone.
- What is the matrix of a chondrite?The matrix is the fine-grained material that fills the spaces between chondrules and other components in a chondrite, like the mortar betwee
- What is the most common type of meteorite to fall?Ordinary chondrites, especially L and H types, make up about four out of five witnessed falls.
- What is the Murchison meteorite?Murchison is a carbonaceous chondrite that fell in Victoria, Australia, on 28 September 1969.
- What is the oldest thing in a meteorite?The oldest things are tiny grains of stardust that formed around other stars before the Sun existed.
- What is the rarest type of meteorite?Many meteorite types are known from only a handful of specimens, such as some achondrite and carbonaceous groups.
- What makes one meteorite more valuable than another?Rarity of type, whether it was a witnessed fall, freshness, beauty, historic importance, size and shape, an official classification and trus
- What should a beginner's meteorite collection include?Start with affordable, representative specimens: an ordinary chondrite, an iron, perhaps a stony-iron slice and an achondrite, each with its
- What was the largest meteorite fall ever witnessed?Sikhote-Alin in Russia in 1947 delivered the most mass of any witnessed fall, an estimated 70 tonnes or more of iron.
- What was the Sutter's Mill meteorite?Sutter's Mill is a rare carbonaceous chondrite that fell in California on 22 April 2012, recovered partly thanks to weather radar, near
- What was the Winchcombe meteorite?Winchcombe is a rare carbonaceous chondrite that fell in Gloucestershire, England, on 28 February 2021.
- Why are carbonaceous chondrites so fragile?They are porous and full of soft clay minerals and organic matter, so they crumble easily, break up in the atmosphere and weather quickly on
- Why are most meteorites chondrites?Most meteorites are chondrites because unmelted, chondritic asteroids are abundant in the parts of the asteroid belt that feed material to E
- Why do chondrites contain both hot and cold ingredients?Chondrites mix high-temperature chondrules and CAIs with low-temperature dust and organics, showing that materials from different places in
- Why do CI chondrites match the composition of the Sun?CI chondrites formed from material that never melted or lost most of its elements, so apart from gases, their chemistry closely matches the
- Why do some meteorites contain diamonds?Diamonds in meteorites form by shock during impacts, by high pressure inside large parent bodies, or as nanodiamonds from gas, some formed b
Impact events (1)
- The Ordovician meteorite rainWhen an asteroid broke apart and Earth was showered with meteorites for millions of years.
Asteroids (3)
- ItokawaItokawa was the first asteroid from which samples were brought back to Earth. Japan's Hayabusa spacecraft arrived in September 2005, stu
- JunoJuno was the third asteroid found, discovered by Karl Harding at Lilienthal, near Bremen, in September 1804.
- RyuguRyugu is a dark, carbon-rich asteroid about 900 metres across, shaped like a spinning top with a ridge around its equator.
Micrometeorites (5)
- Cosmic dust collected by space missionsTo be sure exactly where a grain of dust came from, you have to fetch it yourself.
- What micrometeorites reveal about the early Solar SystemMicrometeorites carry material from many more comets and asteroids than the meteorites in our museums, including fragile, carbon-rich bodies
- Scoriaceous, unmelted and ultracarbonaceous micrometeoritesNot every micrometeorite melts. Some arrive gently enough to keep the minerals, textures and even the organic matter they had in space, maki
- Types of micrometeoriteMicrometeorites are classified first by how much they were heated on the way down, and then by what they are made of.
- What are micrometeorites?Micrometeorites are tiny pieces of rock and metal from space, smaller than about 2 mm, that have survived the fall through Earth's atmos
People (11)
- Ashley KingThe Natural History Museum scientist who collected the Winchcombe meteorite from a family's driveway in 2021 and helped lead its study.
- Brian MasonThe Smithsonian curator who classified thousands of Antarctic meteorites and spotted that the first lunar meteorite looked like Apollo highl
- Edward AndersThe Chicago cosmochemist whose table of Solar System element abundances became a standard, and whose team first found stardust older than th
- Gustav RoseThe Berlin mineralogist who sorted meteorites into families in 1863 and coined the names chondrite and howardite.
- Henry Clifton SorbyThe Sheffield scientist who invented the study of rocks in thin slices and described chondrules as frozen drops of fiery rain.
- Jacques-Louis de BournonThe French mineralogist who described the round grains and metal in fallen stones alongside Edward Howard in 1802.
- John WoodThe planetary scientist who co-created the petrologic types of chondrites and first proposed that the young Moon was covered in a magma ocea
- Klaus KeilThe pioneer of the electron microprobe in meteorite science, who helped show that ordinary chondrites form three distinct groups.
- Renji NaruseThe Japanese glaciologist who found the first meteorite on the Yamato ice field in December 1969, opening up Antarctica's meteorite trea
- Robert HutchisonThe Natural History Museum curator who wrote a standard textbook on meteorites and helped compile the world catalogue of meteorites.
- The Wilcock familyThe Gloucestershire family who found black fragments of the Winchcombe meteorite on their driveway the morning after it fell in 2021.
Britain and Ireland (21)
- The Aldsworth meteoriteA stone that landed in a field of oats in the Cotswolds after a fireball was seen over Cirencester.
- The Appley Bridge meteoriteA 15-kilogram stone that fell after a fireball over Lancashire in the first autumn of the First World War.
- The Ashdon meteoriteA stone seen to fall silently into an Essex field, dug up three days later from 60 centimetres down.
- The Beddgelert meteoriteA stone that crashed through the roof of a hotel in Snowdonia. On 21 September 1949, after loud explosions, a stone of about 790 grams smash
- The Bovedy meteoriteA fireball seen from Wales to Ulster that dropped a rare, little-altered chondrite.
- The Crumlin meteoriteA stone that thumped into a County Antrim farm and was dug out still warm within a quarter of an hour.
- The Danebury meteoriteA small meteorite dug up by archaeologists from a pit inside an Iron Age hillfort.
- The Dundrum meteoriteA warm stone found half buried in a potato drill in Tipperary, now on show in Dublin.
- The Glatton meteoriteA stone that fell into a hedge while a man was working in his vegetable garden. Around midday on 5 May 1991, a man working in his garden in
- The Glenrothes meteoriteScotland's first meteorite find: a few weathered fragments, forgotten for months in a fishing jacket.
- The High Possil meteoriteScotland's first recorded meteorite, which fell beside quarry workers on the edge of Glasgow.
- The Killeter meteoriteA shower of small stones over County Tyrone in 1844, of which only a few fragments survive.
- The Launton meteoriteAn evening fireball and a triple bang over Oxfordshire, then a stone of just over a kilogram.
- The Leighlinbridge meteoriteFour golf-ball-sized stones that fell after a fireball as bright as the full Moon over Carlow.
- The Limerick meteoriteThe largest meteorite fall in Irish history: a shower of stones over County Limerick in 1813.
- The Middlesbrough meteoriteA stone that landed beside a railway line, watched by the workers who dug it out. At 3.35 in the afternoon of 14 March 1881, railway workers
- The Mooresfort meteoriteA stone so hot it could not be handled two hours after landing near workmen on a Tipperary roof.
- The Perth meteoriteA stone that fell on Perth's riverside park in a thunderstorm, of which only a few grams were saved.
- The Pontlyfni meteoriteThe only winonaite ever seen to fall anywhere in the world, recovered on the Welsh coast.
- The Strathmore meteoriteFour stones over the Scottish valley of Strathmore, one through the roof of a lodge.
- The Wiltshire meteoriteBritain's heaviest meteorite: a weathered 93-kilogram stone that sat in a country house garden for generations.
Museums and collections (4)
- Finnish Museum of Natural HistoryThe home of Bjurböle, the meteorite that crashed through sea ice off the Finnish coast in 1899.
- JAXA Extraterrestrial Sample Curation CenterThe clean laboratories that received the first grains ever returned from asteroids, from Itokawa and Ryugu.
- National Museum of Natural History, ParisFrance's national collection, rich in historic French falls such as L'Aigle, Chassigny and Orgueil.
- Geology Museum of the National University of MexicoA historic geology museum that displays the Allende meteorite, which showered northern Mexico in 1969.
Hunting and collecting (1)
- Meteor-wrongs: the rocks that fool peopleHow to tell a meteorite from slag, magnetite, hematite, basalt, concretions, industrial iron, chert, obsidian and other look-alikes, with si
Meteorites (the 60 largest of 42,565)
- JilinH5 · China
- Northwest Africa 869L4-6 · Not recorded
- AllendeCV3 · Mexico
- GhubaraL5 · Oman
- TsarevL5 · Russia
- Kunya-UrgenchH5 · Turkmenistan
- Plainview (1917)H5 · United States
- Long IslandL6 · United States
- Jiddat al Harasis 073L6 · Oman
- OchanskH4 · Russia
- KnyahinyaL/LL5 · Ukraine
- WildaraH5 · Australia
- EtterL5 · United States
- Sayh al Uhaymir 001L5 · Oman
- Sahara 02500L3 · Not recorded
- ParagouldLL5 · United States
- Allan Hills A76009L6 · Antarctica
- HugotonH5 · United States
- BjurböleL/LL4 · Finland
- BruderheimL6 · Canada
- MocsL5-6 · Romania
- Northwest Africa 4037L4-6 · Not recorded
- PutingaL6 · Brazil
- MorlandH6 · United States
- EstacadoH6 · United States
- Clovis (no. 1)H3.6 · United States
- Rio LimayL5 · Argentina
- Saint-SéverinLL6 · France
- PotterL6 · United States
- SuizhouL6 · China
- Dalgety DownsL4 · Australia
- Dhofar 020H4/5 · Oman
- PultuskH5 · Poland
- El HammamiH5 · Mauritania
- Northwest Africa 4528H5 · Not recorded
- New ConcordL6 · United States
- HomesteadL5 · United States
- AlfianelloL6 · Italy
- HolbrookL/LL6 · United States
- Northwest Africa 4561E · Not recorded
- SaratovL4 · Russia
- Jiddat al Harasis 055L4-5 · Oman
- DimmittH3.7 · United States
- Northwest Africa 4544E · Not recorded
- MosheshH · Lesotho
- KunashakL6 · Russia
- BarrattaL4 · Australia
- KainsazCO3.2 · Russia
- Travis County (a)H5 · United States
- ZagH3-6 · Morocco
- OwascoL6 · United States
- Djati-PengilonH6 · Indonesia
- TenhamL6 · Australia
- GarabatoH5 · Argentina
- Kimble CountyH6 · United States
- Bluff (a)L5 · United States
- GlasatovoH4 · Russia
- Forest CityH5 · United States
- Northwest Africa 5940H5-6 · Not recorded
- JaluL6 · Libya