Stannite Group

Nearly isostructural sulfide species sharing the I-42m and I-4 space groups; with a structure that is almost identical to that of the Sphalerite Group species. The general formula is A₂BCX₄ where A = Ag, Cu; B = Cu, Ce, Fe, Hg, Zn; C = As, Ge, In, Sb, Se, Sn and X; and X = S, Se. (Where both the A and B positions are occupied by Cu the formula is typically written A₃BX₄; but using the formula as stated above clarifies the structural position of Cu in the B position.) [Note: Dana 8th classifies Famatinite, Luzonite, and Permingeatite as sulfosalts rather than as sulfides; but Fleischer's Glossary (1999) places them within the Stannite Group. An examination of their reported characteristics suggest the latter to be the better classification.]

A subgroup is the Kësterite Subgroup.