Formula: Bi2S3
Origin of name: From composition
Crystal system: Orthorhombic
Crystal class: 2/m 2/m 2/m
Twinning:
Unit cell: a = 11.15 Ǻ, b = 11.30 Ǻ, c = 3.981 Ǻ
Colour: Lead-gray to tin-white
Diaphaneity:
Luster: Metallic
Habit: Crystals stout to slender prismatic, acicular, sometimes dipyramidal; massive, foliated, fibrous
Hardness: 2
Specific gravity: 6.78
Cleavage: 3; {010} perfect, {100} and {110} imperfect
Tenacity: Flexible, sectile
Streak: Lead-grey
Synonyms/varieties:
Comments: Typically found in low- to high-temperature hydrothermal vein deposits, in tourmaline-bearing copper deposits in granite, in some gold veins formed at high temperatures and in recent volcanic exhalation deposits.
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