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Billingsleyite

Year of discovery: 1968 (North Lily mine, USA), 1989 (Japan)

Locality list: A locality of billingsleyite

• Ag₇AsS₆
• Ag₇(As,Sb)S₆
• [Ag⁺₇][As⁵⁺][S₆]^12-

• Class: Sulfide

• Color: Dark gray
• Luster: Metallic
• Diaphaneity: Opaque

• Habit: Pyramidal, Acicular elongated to [001]
• Twin: (-101)

• Cleavage: Indistinct
• Hardness: 2.5
• Density: 5.9

• System: Cubic
• Group: 23, P2₁3
• Lattice: a=10.5