Formula: (Fe,Ni,Co)3C
Origin of name: For Emil W. Cohen, German mineralogist
Crystal system: Orthorhombic
Crystal class: 2/m 2/m 2/m
Twinning:
Unit cell:
Colour: Tin-white; tarnishes light bronze to golden yellow on exposure
Diaphaneity: Opaque
Luster:
Habit: Crystals tabular, elongated
Hardness: 5.5 to 6
Specific gravity: 7.20 to 7.65
Cleavage: 3; {100}, {001}, {010}
Tenacity:
Streak:
Synonyms/varieties:
Comments: From a meteorite, lunar rocks and native iron
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