Formula: Cu8S5
Origin of name: For Adam Geer, original collector, American
Crystal system: Cubic
Crystal class: -43m
Twinning:
Unit cell:
Colour: Blue-white (reflected light)
Diaphaneity: Opaque
Luster: Metallic
Habit: Coatings, thin, iridescent; platelets, submicroscopic
Hardness: Less than 3.5
Specific gravity: 5.61
Cleavage: None
Tenacity:
Streak: Bluish white
Synonyms/varieties:
Comments:
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