Tongbaite

Tongbaite is a rare mineral that has the chemical formula Cr3C2, or chromium carbide.

Tongbaite
General
CategoryCarbide mineral
Formula
(repeating unit)
Cr3C2
IMA symbolTgb[1]
Strunz classification1.BA.15
Crystal systemOrthorhombic
Crystal classDipyramidal (mmm)
H-M symbol: (2/m 2/m 2/m)
Space groupPnma
Unit cella = 5.52 Å, b = 11.48 Å
c = 2.82 Å; Z = 4
Identification
ColorPale brownish yellow; pale violet in reflected light
Crystal habitPrismatic crystals, pseudohexagonal
TenacityBrittle
Mohs scale hardness8.5
LusterMetallic
DiaphaneityOpaque
Specific gravity6.64 calculated
References[2][3][4]

It was first described in 1983 for an occurrence in Liu village, Tongbai County (桐柏县), Henan Province, China and named for the locality.[3] It occurs in an ultramafic rock deposit.[2] It has also been found in the Tibet Autonomous Region and the Isovsky District, in the Urals of Russia.[3]

References


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