Formula: PbBi2S4
Origin of name: From bismuth and galena
Crystal system: Orthorhombic
Crystal class: 2/m 2/m 2/m
Twinning:
Unit cell: a = 11.65, b = 14.49, c = 4.08
Colour: Light gray to lead-gray, tin-white, may tarnish yellowish or iridescent
Diaphaneity: Opaque
Luster: Metallic
Habit: Crystals lath-like, thin plates, or acicular, often twisted or bent; massive, compact, fibrous to columnar
Hardness: 2.5 to 3.5
Specific gravity: 7.04
Cleavage: 1; {110} good
Tenacity: Uneven fracture
Streak: Black, gray black
Synonyms/varieties: Csiklovaite, beegerite, bonchevite
Comments:
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