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Fletcherite

Year of discovery: 1977 (Fletcher mine, USA), 2015 (Japan)

Locality list: A locality of fletcherite

• CuNi₂S₄
• Cu(Ni,Co)₂S₄
• [Cu⁺][Ni^3.5+₂][S₄]^8-

• Class: Carrollite subgroup < Thiospinel group < Spinel supergroup
• Class: Sulfide

• Cu => Ni: Polydymite
• Cu => Fe: Violarite
• Cu => Co: Siegenite

• Ni => Co: Carrollite
• Ni => Ir: Cuproiridsite
• Ni => Cr: Cuprokalininite
• Ni => Rh: Cuprorhodsite
• Ni => Pt: Malanite
• Ni => (Cr,Sb): Florensovite

• Color: Dark gray
• Luster: Metallic
• Diaphaneity: Opaque

• Hardness: 5

• System: Cubic
• Group: m3m, Fd3m
• Lattice: a=9.5