Zincochromite
Zincochromite is a zinc chromium oxide mineral with the formula ZnCr2O4. It is the zinc analogue of chromite, hence the name. It was first described in 1987 as an occurrence in a uranium deposit near Lake Onega, Russia. It has also been reported from Dolo Hill, New South Wales, Australia, and from the Tarkwa Mine in the Ashanti gold belt of Ghana.
Zincochromite | |
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Zincochromite found in Russia | |
General | |
Category | Spinel group |
Formula (repeating unit) | ZnCr2O4 |
IMA symbol | Zchr |
Strunz classification | 4.BB.05 |
Crystal system | Cubic |
Crystal class | Hexoctahedral (m3m) H-M symbol: (4/m 3 2/m) |
Space group | Fd3m |
Unit cell | a = 8.32 Ã…; Z = 8 |
Identification | |
Color | Brownish black |
Crystal habit | Zoned euhedral crystals with hexagonal outline |
Mohs scale hardness | 5.8 |
Luster | Semimetallic |
Streak | Brown |
Diaphaneity | Opaque, translucent in thin slivers |
Optical properties | Isotropic |
Other characteristics | Weakly paramagnetic |
References |
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