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Aramayoite

Year of discovery: 1926 (Ánimas mine, Bolivia), 1980 (Japan)

Locality list: 3 localities of aramayoite

• Ag(Sb,Bi)S₂, Ag₃Sb₂BiS₆
• (Ag,Cu)(Sb,Bi,As)S₂
• [Ag⁺₃][Sb³⁺₂][Bi³⁺][S₆]^12-

• Class: Binary sulfosalts < Sulfosalt class
• Class: Sulfosalt

• Sb => Bi: Matildite, Schapbachite

• Bi => Sb: Miargyrite, Cuboargyrite, Baumstarkite

• Sb₂Bi => As: Smithite, Trechmannite

• Color: Steel black, Bright red in thin sections
• Streak: Black-Reddish brown, Darker than Miargyrite
• Luster: Metallic
• Diaphaneity: Opaque

• Habit: (010) Hexagonal platy
• Striation: {100}, {001}
• Twin: {-101}

• Cleavage: Perfect on {010} and {100} (2 planes), Indistinct on {001} (1 plane)
• Hardness: 2.5
• Density: 5.6

• System: Triclinic
• Group: (-1), P(-1)
• Lattice: a=7.8, b=8.3, c=8.8, α=100.6, β=104.0, γ=90.2

Etymology: Felix A. Aramayo, owner of Aramayo mine