Formula: PbCuBi3S6
Origin of name: After locality; Krupka, Czech Republec
Crystal system: Orthorhombic
Crystal class: mm2
Twinning:
Unit cell:
Colour: Dark steel-gray
Diaphaneity: Opaque
Luster: Metallic
Habit: Fibrous aggregates
Hardness: 3.5
Specific gravity: 6.99
Cleavage: None
Tenacity:
Streak:
Synonyms/varieties:
Comments:
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