Formula: Co9S8
Origin of name: From Cobalt and pentlandite
Crystal system: Cubic
Crystal class: 4/m 3 2/m
Twinning:
Unit cell: a = 9.973 Å
Colour: Bronze-yellow
Diaphaneity: Opaque
Luster: Metallic
Habit: Exsolved lamellae, minute crystals; massive, fine-grained
Hardness: 4 to 4.5
Specific gravity: 5.34
Cleavage: 1; {001} distinct
Tenacity:
Streak:
Synonyms/varieties:
Comments: Series with pentlandite. Found in hydrothermal veins with other sulphides and arsenates
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