1) Sulfide mineral 
Spinel structural group | formula = Cu(Ni,Co)2S4 | strunz = 02.DA.05 | dana = | symmetry = Isometric hexoctahedral H–M Symbol 4/m{overline|3}2/m | unit cell = a = 9.520 Å; Z = 8 | molweight = | color = Steel gray, creamy white in polished section | colour = | habit = Minute subhedral to euhedral crystals typically enclosed within other sulfide ...