DAVID PARKER / SCIENCE PHOTO LIBRARY DAVID PARKER / SCIENCE PHOTO LIBRARY
Stony meteorite. Thinly-sliced piece of a stony (chondritic) meteorite on a microscope slide. This fragment is from the Gold Basin meteorite which struck northern Arizona, USA, about 20,000 years ago. The slice is 30 millionths of a metre thick and has been highly polished. This allows the crystal structures in the meteorite to be seen with a light microscope. The different minerals may also be identified by their different colours. This type L4 ordinary chondrite meteorite is made of near-spherical, rocky (silicate) bodies with diameters between 0.2 and 4 millimetres: it also has small specks of metal. Chondrites make up about 86% of the solar system's meteorites.
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