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From Wikipedia, the free encyclopedia
Kosmochlor is a rare chromium sodium clinopyroxene with the chemical formula NaCr3+Si2O6.
Kosmochlor | |
---|---|
![]() Chromite (metallic black), kosmochlor pyroxene (emerald green to dark green to black), chromian jadeite pyroxene (green), chromiferous arfvedsonite amphibole (green or gray), symplectite (green, a finely-crystalline mineral mix of mostly chromian jadeite) | |
General | |
Category | Inosilicate mineral |
Formula (repeating unit) | NaCr3+Si2O67 |
IMA symbol | Kos[1] |
Strunz classification | 9.DA.25 |
Crystal system | Monoclinic |
Crystal class | Prismatic (2/m) (same H-M symbol) |
Space group | C2/c |
Unit cell | a = 9.57, b = 8.71 c = 5.26 Å; β = 107.49°; Z = 4 |
Identification | |
Color | Emerald-green |
Crystal habit | Prismatic crystals and fibrous aggregates |
Twinning | Simple, lamellar on {100} and {001} |
Cleavage | Good on {110} parting on {001} |
Mohs scale hardness | 6 |
Luster | Vitreous |
Streak | Light green |
Diaphaneity | Semitransparent |
Specific gravity | 3.51-3.60 |
Optical properties | Biaxial (-) |
Refractive index | nα = 1.766 nγ = 1.781 |
Birefringence | δ = 0.015 |
Pleochroism | X = yellowish green; Y = blue-green, grass-green; Z = emerald-green |
Dispersion | r > v |
References | [2][3][4] |
The name is from German kosmisch, for its occurrence in meteorites, and the Greek chlor, for green.[4] It was first reported in 1897 from the Toluca meteorite, Jiquipilco, Mexico.[2]
It occurs as a major constituent of some jadeitites and as an accessory mineral of some iron meteorites. Associated minerals include cliftonite (graphite), chromian diopside, troilite at Toluca; daubreelite, krinovite, roedderite, high albite, richterite, chromite (Canyon Diablo); and jadeite, chromite and chlorite (Burma).[3]
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