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Carrollite

Year of discovery: 1852 (Patapsco mine, USA), 1942 (Japan)

Locality list: 7 localities of carrollite

• CuCo₂S₄
• Cu(Co,Ni)₂S₄
• [Cu⁺][Co^3.5+₂][S₄]^8-

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

• Cu => Co: Linnaeite

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

• S => Se: Tyrrellite

• Color: Light gray-Steel gray
• Tarnish: Reddish brown (Rare)
• Streak: Dark gray
• Luster: Metallic
• Diaphaneity: Opaque

• Habit: Dodecahedral
• Twin: {111}

• Cleavage: No, Parting on {001} (3 planes)
• Hardness: 4.5-5.5
• Density: 4.7

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

Etymology: Carroll Corp., Maryland, USA