Formula: (Pt,Pd,Ni)S
Origin of name: For R. A. Cooper
Crystal system: Tetragonal
Crystal class: 4/m 2/m 2/m
Twinning: Occasionally
Unit cell: a = 3.470 Å, c = 6.110 Å
Colour: Steel-gray
Diaphaneity: Opaque
Luster: Metallic
Habit: Distorted crystal fragments; irregular grains
Hardness: 4 to 5
Specific gravity: 9.5
Cleavage: 1; {011}
Tenacity: conchoidal fracture
Streak:
Synonyms/varieties:
Comments: Dimorphous with braggite. Important platinum ore mineral, found in concentrates from norites, also in breccia chalcopyrite-millerite ore
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