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- n. A high-pressure polymorph of silica found in extreme conditions such as the impact craters of meteorites, with the chemical composition of silicon dioxide, SiO2.
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These other forms of silica include opal, chalcedony, flint and chert (non-crystalline), and cristobalite, tridymite, coesite, and stichovite.
Shoemaker, who wrote his doctoral thesis on the crater, was renowned for his work on extraterrestrial impacts and the mechanics of meteorite impacts, and for his co-discovery of coesite, a shocked form of quartz rarely found naturally on Earth.