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Calaverite

Year of discovery: 1868 (Stanislaus mine, USA), 1931 (Japan)

Locality list: 8 localities of calaverite

• AuTe₂
• [Au³⁺][Te₂]

• Class: Krennerite group
• Class: Telluride
• Soluble in: Aqua regia (Decompose)
• Insoluble in: HCl
• Substitution pseudomorph: Replaced by Gold.

• Polymorph: Krennerite (Orthorhombic)

• Au => Ni: Melonite
• Au => Pd: Merenskyite
• Au => Pt: Moncheite
• Au => Ir: Shuangfengite

• Au₂ => AgAu: Sylvanite, Muthmannite
• Au₂ => CuAu: Kostovite

• Color: Yellowish green-Silver white
• Streak: Greenish gray-Yellowish gray
• Luster: Metallic
• Diaphaneity: Opaque

• Habit: Tabular, Pointed tabular elongated to [010]
• Striation: [010]
• Twin: {110}, {031}{111} rare

• Cleavage: Unclear (It was desribed as perfect (1 plane) in Japan. but it seems misrecognition of twin surface.)
• Hardness: 2.5-3
• Density: 9.3

• System: Monoclinic
• Group: 2/m, C2/m
• Lattice: a=7.2, b=4.4, c=5.1, β=90.3

Etymology: Calaveras Corp., California, USA