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Gallobeudantite, PbGa (sub 3) (sub 2) (OH) (sub 6) , a new mineral species from Tsumeb, Namibia, and associated new gallium analogues of the alunite-jarosite family

, : Gallobeudantite, PbGa (sub 3) (sub 2) (OH) (sub 6) , a new mineral species from Tsumeb, Namibia, and associated new gallium analogues of the alunite-jarosite family. The Canadian Mineralogist 34, Part 6: 1305-1315

Gallobeudantite, ideally PbGa (sub 3) [(AsO (sub 4) ),(SO (sub 4) )] (sub 2) (OH) (sub 6) , is the newly defined Ga analogue of beudantite. It occurs as zoned rhombohedra, up to 200 mu m along an edge, in vugs in a single specimen of massive Cu-bearing sulfides from Tsumeb, Namibia. Gallobeudantite is variably pale yellow, greenish, or cream-colored, with a white to pale yellow streak, vitreous luster, even to conchoidal fracture, hardness of 4, and D(calc.) 4.61 g/cm (super 3) for Z = 3. The mineral is nonpleochroic, uniaxial negative, omega 1.763(5), epsilon 1.750(5). A single-crystal X-ray refinement of the structure (R = 0.078) showed the mineral to be rhombohedral, space group R3m, a 7.225(4), c 17.03(2) Aa, and isostructural with corkite. The strongest lines of the X-ray powder-diffraction pattern [d in Aa (l)(hkl)] are: 5.85(90)(101), 3.59(40)(110), 3.038(100)(113) and 2.271(40)(107). Within the crystals, in addition to gallobeudantite, are zones containing Ga-rich beudantite and hidalgoite, and the unnamed Ga analogues of segnitite, corkite, kintoreite, and arsenocrandallite. The last contains up to 12.7 wt.% GeO (sub 2) , which is about 75% of the Ge substitution possible if the formula is assumed to be Ca(Ga,Al,Fe) (sub 2) Ge (super 4+) (AsO (sub 4) ) (sub 2) (OH) (sub 6) . The new name gallobeudantite alludes to the predominance of Ga in the position occupied by Fe (super 3+) in beudantite-type minerals.


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