AM_Gallobeudantite Formula: Pb6 Ga3 As S O17 H9 Name: Gallobeudantite Unit cell: 7.225 7.225 17.03 90.0 90.0 120.0 , V=769.88 Space group: R3M (160)

Jambor J L , Owens D R , Grice J D , Feinglos M N , The Canadian Mineralogist , 34 (1996) p.1305-1315, Gallobeudantite, PbGa3[(AsO4),(SO4)]2(OH)6, a new mineral species from Tsumeb,, Namibia, and associated new gallium analogues of the alunite - jarosite family, Locality: Tsumeb, Namibia