stishovite

[stish-uh-vahyt]
noun Mineralogy.
a rare polymorph of quartz, SiO 2 , formed under very high pressure, as by meteorite impact.
Compare coesite.


Origin:
1960–65; named after S. M. Stishov, 20th-century Russian mineralogist; see -ite1

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stishovite

high-pressure, metastable polymorph of silica (SiO2), having a rutile-type tetragonal structure; silicon is in six-fold coordination with oxygen while each oxygen atom is shared with three silicon atoms. Stishovite was first discovered in sandstone that had been converted to glass at Meteor Crater, Ariz., and its occurrence with coesite in many other craters is evidence that it was formed by kinetic energy imparted by large-scale impact on the surrounding rock

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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Other silica types such as stishovite can provide evidence of shock metamorphism.
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