Formula: Pb13(Cu,Ag)(Bi,Sb)9S28
Origin of name: Locality; Giessen, Valais Canton, Switzerland
Crystal system: Orthorhombic
Crystal class: 2/m
Twinning:
Unit cell:
Colour: Grayish black
Diaphaneity: Opaque
Luster: Metallic
Habit: Acicular, fine needles
Hardness: ~ 2.5
Specific gravity: 7.45
Cleavage: None
Tenacity:
Streak: Grayish-black
Synonyms/varieties:
Comments:
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