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Robinsonite

Year of discovery: 1951 (Red Bird mine, USA), 1997 (Japan)

Locality list: A locality of robinsonite

• Pb₄Sb₆S₁₃
• [Pb²⁺₄][Sb³⁺₆][S₁₃]^26-

• Class: Boulangerite group < Rod-type Pb sulfosalts < Sulfosalt class
• Class: Sulfosalt

• Sb => Bi: Cannizzarite

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

• Habit: Prismatic, fibrous elongated to [001]
• Striation: [001]

• Cleavage: No
• Hardness: 2.5-3
• Density: 5.3

• System: Monoclinic
• Group: 2/m, I2/m
• Lattice: a=23.6, b=4.0, c=24.4, β=93.8

Etymology: Dr. Stephen Clive Robinson (1911-1981), Canadian geologist who synthesized this mineral for the first time.