Formula: Cu10(Fe,Pb)S6
Origin of name: For Anatoli Betekhtin, Russian economic geologist
Crystal system: Orthorhombic
Crystal class: 2/m 2/m 2/m
Twinning:
Unit cell: a = 14.69 Ǻ, b = 22.72 Ǻ, c = 3.861 Ǻ
Colour: Black; in polished section cream which dulls
Diaphaneity:
Luster:
Habit: Crystals tiny, acicular; irregular masses
Hardness: ~ 3
Specific gravity: 5.96 to 6.05
Cleavage: 3
Tenacity:
Streak:
Synonyms/varieties:
Comments:
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