Keatite is a silicate mineral with the chemical formula SiO2 (silicon dioxide) that was discovered in 2013. It is a tetragonal polymorph of silica first known as a synthetic phase. It was reported as minute inclusions within clinopyroxene (diopside) crystals in an ultra high pressure garnet pyroxenite body. The host rock is part of the Kokchetav M...
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http://en.wikipedia.org/wiki/Keatite
(from the article `silica mineral`) Keatite is a tetragonal form of silica known only from the laboratory, where it can be synthesized metastably in the presence of steam over a ...
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http://www.britannica.com/eb/a-z/k/18
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