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Cosalite (Photo)

Year of discovery: 1868 (Cosalá mine, Mexico), 1960 (Japan)

Locality list: 29 localities of cosalite

• Pb₂Bi₂S₅
• [Pb²⁺₂][Bi³⁺₂][S₅]^10-

• Class: Boulangerite group < Rod-type Pb sulfosalts < Sulfosalt class
• Class: Sulfosalt
• Soluble in: HCl (Slowly), HNO₃

• Bi => As: Dufrénoysite (Dufrenoysite)
• Bi => (Sb,As): Veenite

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

• Habit: Prismatic, Acicular elongated to [001]
• Aggregate: Radial, Plumosity

• Cleavage: Good on {010} (1 plane)
• Hardness: 2.5-3
• Density: 7.0

• System: Orthorhombic
• Group: mmm, Pbnm
• Lattice: a=19.1, b=23.9, c=4.1

Etymology: Cosala, Mexico