1) Copper mineral 
Spinel structural group | boxwidth = 24 | image = Carrollite02.jpg | caption = Carrollite from Kambove, Katanga. This specimen is 4.3 cm wide, with a 1.2 cm carrollite crystal partly covered by pyrite, between calcite crystals. | formula = CuCo2S4 | molweight = | strunz = 02.DA.05 | dana = 2.10.1.2 | color = Light to dark grey, rarely tarnishes to...