Formula: Au4Cu(Te,Pb)
Origin of name: For M.S. Bezsmertnaia and V.V. Bezsmert, Russian geologists and researchers on ore deposits
Crystal system: Orthorhombic
Crystal class: 2/m /2m 2/m
Twinning:
Unit cell: a = 4.036 Å, b = 4.025 Å, c = 4.061 Å
Colour: Gold in polished sections
Diaphanetiy: Opaque
Luster: Metallic
Habit: Irregular grains to 0.2 mm
Hardness: 4.5
Specific gravity: 16.3
Cleavage: None
Tenacity:
Streak:
Synonyms/varieties:
Comments: Found in the cementation zone of a volcanogenic gold telluride deposit, rarely as rims around grains of gold
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