Formula: CuSe
Origin of name: For F. Klockmann, German mineralogist
Crystal system: Hexagonal
Crystal class: 6/m 2/m 2/m
Twinning:
Unit cell:
Colour: Dark gray to bluish black
Diaphaneity: Opaque
Luster: Metallic on fresh fracture, becomes dull on exposure
Habit: Aggregates, dense granular or flaky
Hardness: 2 to 2.5
Specific gravity: 5.99
Cleavage: 1; {0001} perfect
Tenacity:
Streak:
Synonyms/varieties:
Comments:
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