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Kosmochlor is a rare chromium sodium clinopyroxene with the chemical formula NaCr3+Si2O6.
The name is from German language kosmisch, for its occurrence in meteorites, and the Greek language chlor, for green. It was first reported in 1897 from the Toluca meteorite, Jiquipilco, Mexico.
It occurs as a major constituent of some and as an accessory mineral of some . Associated minerals include cliftonite (graphite), chromian diopside, troilite at Toluca; daubreelite, krinovite, roedderite, high albite, richterite, chromite (Canyon Diablo); and jadeite, chromite and Chlorite group (Burma).
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