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stishovite

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stish⋅ov⋅ite

  [stish-uh-vahyt]
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–noun Mineralogy.
a rare polymorph of quartz, SiO2, formed under very high pressure, as by meteorite impact.
Compare coesite.

Origin:
1960–65; named after S. M. Stishov, 20th-century Russian mineralogist; see -ite 1
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2009.
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stish·ov·ite   (stĭsh'ə-vīt')   
n.  A dense tetragonal polymorph of quartz that is formed under great pressure and is often associated with meteoroid impact.

[After Sergei Mikhailovich Stishov (born 1937), Russian mineralogist.]
The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2009 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Encyclopedia

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

Learn more about stishovite with a free trial on Britannica.com.

Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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