AM_Melanothallite Formula: Cu2 Cl2 O Name: Melanothallite Unit cell: 7.4691 9.5969 9.7 90.0 90.0 90.0 , V=695.30 Space group: FDDD (70)

Krivovichev S V , Filatov S K , Burns P C , The Canadian Mineralogist , 40 (2002) p.1185-1190, The cuprite-like framework of OCu4 tetrahedra in the crystal structure, of synthetic melanothallite, Cu2OCl2, and its negative thermal expansion