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 crystals.
Microscopes open up the hidden world inside meteorites.
Hand lenses. A simple 10x hand lens reveals a lot on a cut and polished meteorite slice: round chondrules, shiny metal flecks, bronze troilite grains and dark fusion crust. Teach pupils to hold the lens close to the eye and bring the specimen towards it.
Digital microscopes. Inexpensive USB or tablet microscopes can be connected to a projector or screen, so the whole class can see enlarged images. Pupils can capture images, add scale bars and label features.
Binocular microscopes. Stereo microscopes give three-dimensional views of surfaces, ideal for examining crust, cracks and possible micrometeorites.
Thin section images. Real meteorite thin sections viewed under polarised light show chondrules glowing in bright colours. Schools are unlikely to have polarising microscopes, but published images can be used for identification activities. Pupils can compare thin sections of chondrites, achondrites and Earth rocks such as basalt and granite.
Activities. - Draw and label what is seen at different magnifications. - Measure chondrule sizes using a scale and calculate the average. - Compare a chondrite with a terrestrial rock and list differences. - Search for possible micrometeorites in sieved dust.
Skills. These activities develop observation, measurement, scientific drawing and understanding of magnification.
Care. Handle specimens over trays, clean lenses gently, and do not scratch polished surfaces.
Microscopy helps pupils understand that scientists identify meteorites by evidence they can see and measure.