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Betekhtinite

Year of discovery: 1955 (Fortschritt (Wolf) shaft, Germany, and Ernst Thälmann (Vitzthum) shaft, Germany), 1971 (Japan)

Locality list: 2 localities of betekhtinite

• Pb₂Cu₂₁S₁₅
• Pb₂(Cu,Fe²⁺)₂₁S₁₅
• [Pb²⁺₂][Cu²⁺₂₁][S₁₅]

• Class: Sulfide

• Color: Black
• Streak: Black
• Luster: Metallic
• Diaphaneity: Opaque

• Habit: Acicular

• Cleavage: Perfect (3 planes)
• Hardness: 3-3.5
• Density: 6.0

• System: Orthorhombic
• Group: mmm, Immm
• Lattice: a=14.7, b=22.8, c=3.9

Etymology: Anatolii Georgievich Betekhtin (1897-1962), Russian mineralogist and economic geologist