Violarite General Category Sulfide mineral Thiospinel group Spinel structural group Formula (repeating unit) (Fe2+Ni23+S4) Strunz classification 2.DA.05 Crystal system Isometric Crystal class Hexoctahedral (m3m) H-M symbol: (4/m 3 2/m) Space group Fd3m Unit cell a = 9.46 Å; Z = 8 Identification References [1][2][3]