Keatite

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Keatite
Keatite.png
Crystal structure
General
Category Silicate mineral
Formula
(repeating unit)
SiO2
Strunz classification 4.DA.45
Crystal system Tetragonal
Identification
Crystal habit Microscopic inclusions

Keatite is a silicate mineral with the chemical formula SiO2 (silicon dioxide) that was discovered in nature in 2013. It is a tetragonal polymorph of silica first known as a synthetic phase.[1] 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 Massif in Kazakhstan.[2]

Keatite was synthesized in 1954 and named for Paul P. Keat who discovered it while studying the role of soda in the crystallization of amorphous silica.[3] Keatite was well known before 1970 as evidenced in few studies from that era.[4][5]

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