Formula: (Cu,Fe)(Re,Mo)4S8
Origin of name: for Prof. Mahmud Tarkian (1941-), specialist of ore microscopy of the University of Hamburg, Germany, who first described the synthetic material and determined its structure
Crystal system: Cubic/Isometric
Crystal class: 43m
Twinning:
Unit cell: a = 9.563
Colour: Black
Diaphaneity: Opaque
Luster: Metallic
Habit: in grains to 0.l mm across, included in pentlandite and pyrrhotite
Hardness: 5.5-6
Specific gravity: 7.30 (calculated)
Cleavage:
Tenacity: Brittle, irregular fracture
Streak: Black
Synonyms/varieties:
Comments:
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