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.[3] It has also been reported from Dolo Hill, New South Wales, Australia, and from the Tarkwa Mine in the Ashanti gold belt of Ghana.[1]

Zincochromite
Zincochromite found in Russia
General
CategorySpinel group
Formula
(repeating unit)
ZnCr2O4
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[1][2][3][4]

References


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