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Fukuchilite

Year of discovery: 1969 (Japan as the first occurence in the World)

Locality list: A locality of fukuchilite

• Cu₃FeS₈
• [Cu²⁺₃][Fe²⁺][S₈]^8-

• Class: Pyrite group
• Class: Disulfide
• Probably Fe-bearing Villamanínite (Villamaninite)

• Cu => Fe: Pyrite, Marcasite

• Fe => Cu: Villamanínite (Villamaninite)

• Color: Dark brownish gray similar to bornite
• Luster: Sub-Metallic
• Diaphaneity: Opaque

• Aggregate: Massive aggregate with pyrite and covellite

• Hardness: 6
• Density: 4.9

• System: Cubic
• Group: m3, Pa3
• Lattice: a=5.6

Etymology: Nobuyo Fukuji (1877-1934), Japanese mineralogist