Tridymite and cristobalite are high-temperature polymorphs of SiO2 that action in high-silica agitable rocks. Coesite is a denser polymorph of quartz begin in some meteorite appulse sites and in metamorphic rocks formed at pressures greater than those archetypal of the Earth's crust. Stishovite and Seifertite are yet denser and higher-pressure polymorphs of quartz begin in some meteorite appulse sites. Lechatelierite is an baggy silica bottle SiO2 which is formed by lightning strikes in quartz sand.
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