Definitions
from Wiktionary, Creative Commons Attribution/Share-Alike License.
- noun mineralogy A high-pressure
polymorph ofsilica found in extreme conditions such as theimpact craters ofmeteorites , with the chemical composition ofsilicon dioxide ,Si O 2.
Etymologies
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Examples
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These other forms of silica include opal, chalcedony, flint and chert (non-crystalline), and cristobalite, tridymite, coesite, and stichovite.
Quartz 2008
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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.
Signs of the Times 2010
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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.
Signs of the Times 2010
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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.
Signs of the Times 2010
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