AM_Tetrahedrite Formula: Cu7.68 Fe1.44 Ag2.118 (Sb2.7 As1.3) S13 Name: Tetrahedrite Unit cell: 10.53 10.53 10.53 90.0 90.0 90.0 , V=1167.58 Space group: I-43M (217)

Johnson M L , Burnham C W , American Mineralogist , 70 (1985) p.165-170, Crystal structure refinement of an arsenic-bearing argentian tetrahedrite