1) Superhard material
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https://www.crosswordclues.com/clue/stishovite
Stishovite is an extremely hard, dense tetragonal form (polymorph) of silicon dioxide. It is very rare on the earth`s surface. It may however be a predominant form of silicon dioxide in the earth, especially in the lower mantle. Stishovite was named after Sergey M. Stishov, a Russian high-pressure physicist who first synthesized the mineral in 19....
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http://en.wikipedia.org/wiki/Stishovite
high-pressure, metastable polymorph of silica (SiO2), having a rutile-type tetragonal structure; silicon is in six-fold coordination with oxygen ... [5 related articles]
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http://www.britannica.com/eb/a-z/s/164
A dense, high-pressure phase of quartz that has so far been identified only in shock-metamorphosed, quartz-bearing rocks from meteorite impact craters.
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http://www.daviddarling.info/encyclopedia/S/stishovite.html
A dense, high-pressure phase of quartz that has so far been identified only in shock-metamorphosed, quartz-bearing rocks from meteorite impact craters.
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http://www.solarviews.com/eng/terms.htm
a rare polymorph of quartz, SiO, formed under very high pressure, as by meteorite impact. Cf.
Found on
https://www.infoplease.com/dictionary/stishovite
No exact match found.
