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
Zincochromite found in Russia
General
CategorySpinel group
Formula
(repeating unit)
ZnCr2O4
IMA symbolZchr
Strunz classification4.BB.05
Crystal systemCubic
Crystal classHexoctahedral (m3m)
H-M symbol: (4/m 3 2/m)
Space groupFd3m
Unit cella = 8.32 Ã…; Z = 8
Identification
ColorBrownish black
Crystal habitZoned euhedral crystals with hexagonal outline
Mohs scale hardness5.8
LusterSemimetallic
StreakBrown
DiaphaneityOpaque, translucent in thin slivers
Optical propertiesIsotropic
Other characteristicsWeakly paramagnetic
References
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