Formula: (Ge,Fe)Fe2O4
Origin of name: For Bruno Geier, Namibian mineralogist
Crystal system: Cubic
Crystal class: 4/m -3 2/m
Colour: Gray, black
Diaphaneity: Opaque
Habit: Massive, thin rims on tennantite
Hardness: > 4.5
Specific gravity: 5.51
Cleavage: None
Synonyms/varieties:
Comments:
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