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Kostovite

Year of discovery: 1966 (Chelopech mine, Bulgaria), 1990 (Japan)

Locality list: A locality of kostovite

• CuAuTe₄
• [Cu⁺][Au³⁺][(Te₂)₂]^4-

• Class: Krennerite group
• Class: Ditelluride

• Cu => Au: Calaverite, Krennerite
• Cu => Ag: Sylvanite, Muthmannite

• CuAu => Ni₂: Melonite
• CuAu => Pd₂: Merenskyite
• CuAu => Pt₂: Moncheite
• CuAu => Ir₂: Shuangfengite

• Color: Gray
• Luster: Metallic
• Diaphaneity: Opaque

• Cleavage: Distinct (1 plane)
• Hardness: 2-2.5

• System: Orthorhombic
• Group: mm2, Pma2
• Lattice: a=16.5, b=8.8, c=4.4