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Furutobeite

Year of discovery: 1981 (Japan as the first occurence in the World)

Locality list: 2 localities of furutobeite

• Cu₆PbS₄
• (Cu,Ag)₆PbS₄
• [Cu⁺₆][Pb²⁺][S₄]^8-

• Class: Sulfide

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

• Habit: Granular
• Twin: (-101)

• Hardness: 3
• Density: 6.7

• System: Monoclinic
• Group: m, Cm
• Lattice: a=20.0, b=4.0, c=9.1, β=101.6

Etymology: Fukutobe mine in Akita prefecture, Japan, where this mineral was discovered for the first time.