1) Cubic mineral 
Spinel structural group | formula = (Ni,Co)3S4 | strunz = 02.DA.05 | symmetry = Isometric hexoctahedralH-M symbol: (4/m{overline|3} 2/m) Space group: F d3m | unit cell = a = 9.41 Å; Z=8 | molweight = | color = Light to steel-grey, violet-gray (tarnished) | colour = | habit = As octahedral crystals, granular, massive | system = Cubic | twinning = ...