Formula: Cr3C2
Origin of name: after locality Tongbai County, Henan, China
Crystal system: Orthorhombic
Crystal class: 2/m 2/m 2/m
Twinning:
Unit cell: a = 5.57, b = 11.47, c = 2.816
Colour: Brownish yellow, light brownish yellow
Diaphaneity: Opaque
Luster: Strong metallic
Habit: crystals prismatic, pseudohexagonal, to 0.3 mm, may have spear-like terminations
Hardness: 8.5
Specific gravity: 6.64 (calculated)
Cleavage:
Tenacity: Brittle
Streak: Dark gray
Synonyms/varieties:
Comments: Found in ultramafic rocks
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