AM_Roeblingite Formula: Pb2 Mn Ca6 Si6 S2 O32 H12 Name: Roeblingite Unit cell: 13.208 8.287 13.089 90.0 106.65 90.0 , V=1372.59 Space group: C12/M1 (12)

Moore P B , Shen J , American Mineralogist , 69 (1984) p.1173-1179, Roeblingite, Pb2Ca6(SO4)2(OH)2(H2O)4[Mn(Si3O9)2]: Its crystal structure and, comments on the lone pair effect