[ Top ] [ Japanese ]

Krupkaite

Year of discovery: 1974 (Barbora adit, Czech), 1981 (Japan)

Locality list: 3 localities of krupkaite

• PbCuBi₃S₆
• [Pb²⁺][Cu⁺][Bi³⁺₃][S₆]^12-

• Class: Aikinite-Bismuthinite series < Aikinite-Bismuthinite group < Rod-type Pb sulfosalts < Sulfosalt class
• Class: Sulfosalt

• (CuPb)_0.5(Bi[])_0.5 => Bi[]: Bismuthinite (Series)
• (CuPb)_0.5(Bi[])_0.5 => (CuPb)_0.17(Bi[])_0.83: Pekoite (Series)
• (CuPb)_0.5(Bi[])_0.5 => (CuPb)_0.33(Bi[])_0.66: Gladite (Series)
• (CuPb)_0.5(Bi[])_0.5 => (CuPb)_0.40(Bi[])_0.60: Salzburgite (Series)
• (CuPb)_0.5(Bi[])_0.5 => (CuPb)_0.43(Bi[])_0.57: Paarite (Series)
• (CuPb)_0.5(Bi[])_0.5 => (CuPb)_0.67(Bi[])_0.33: Emilite (Series)
• (CuPb)_0.5(Bi[])_0.5 => (CuPb)_0.83(Bi[])_0.17: Friedrichite (Series)
• (CuPb)_0.5(Bi[])_0.5 => CuPb: Aikinite (Series)

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

• Habit: Acicular
• Aggregate: Intergrown with bismuthinite

• Hardness: 3.5-4
• Density: 7.0

• System: Orthorhombic
• Group: mm2, Pmc2₁
• Lattice: a=4.0, b=11.2, c=11.6

Etymology: Krupka in Czechoslovakia