Questions answered · Identifying a meteorite

Can a meteorite have layers or stripes?

The short answer

Generally no. Meteorites lack the bedding layers found in sedimentary rocks, although some show veins, flow lines on their crust or patterns inside.

Many Earth rocks show layers, called bedding, because they formed from sediments such as sand and mud deposited in water or by wind. Sandstones, shales and limestones commonly have visible stripes. Metamorphic rocks such as slate and gneiss can show banding from pressure and heat.

Meteorites did not form this way, so they usually do not have layers. A rock with clear parallel bands or flat layers is very likely terrestrial.

However, some meteorite features might be confused with layering:

Shock veins. Dark, thin veins of melted rock cross some chondrites. They are irregular, not regular layers.

Flow lines. The fusion crust of some meteorites, especially oriented ones, shows fine lines where molten crust flowed backwards in the airstream. These are surface features, not internal layers.

Widmanstätten patterns. Etched iron meteorites show criss-crossing bands of metal crystals, but these appear only after cutting, polishing and etching with acid by experts.

Breccia textures. Many meteorites are breccias, with light and dark fragments, which can look patchy.

Rare cases. A few unusual meteorites and lunar breccias show faint layering or foliation from compaction, but these are uncommon and need expert study.

If your rock has distinct layers, look carefully at what kind of rock it is: it may be a sedimentary rock such as sandstone or ironstone. These can still be interesting, and a local museum or geology group can help identify them.

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