Formula: Cu5As2
Origin of name: For J. Koutek, Czech geologist
Crystal system: Hexagonal
Crystal class: 2/m 2/m 2/m
Twinning:
Unit cell:
Colour: Bluish gray in reflected light
Diaphaneity:
Luster: Metallic
Habit: Fine grains
Hardness: 4 to 4.5
Specific gravity: 8.48
Cleavage: None
Tenacity:
Streak: Black
Synonyms/varieties:
Comments:
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