Formula: CuMnO2
Origin of name: For K. Credner, German geologist
Crystal system: Monoclinic
Crystal class: 2/m
Twinning:
Unit cell:
Colour: Iron-black
Diaphaneity: Opaque
Luster: Bright metallic
Habit: Six-sided plates forming radiating hemispheres or spherulitic groups, earthy masses
Hardness: 4
Specific gravity: 5.34
Cleavage: 5; {100} and {001} perfect; {-111} good, {111} and {212}
Tenacity:
Streak: Black with brownish tint
Synonyms/varieties:
Comments:
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