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i Bali
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uni2
1 Department of Geography, Geology and Mineralogy, University of Salzburg, Hellbrunnerstrasse 34/III, A–5020 Salzburg, Austria
2 Geological Institute, University of Copenhagen, Østervoldgade 10, DK–1350 Copenhagen, Denmark
E-mail address: dan.topa{at}sbg.ac.at
Salzburgite, Cu1.6Pb1.6Bi6.4S12, with a 4.007(1), b 44.81(1), c 11.513(3) Å, space group Pmc21, Z = 4, and paarite, Cu1.7Pb1.7Bi6.3S12, with a 4.0070(6), b 55.998(8), c 11.512(2) Å, space group Pmcn, Z = 5, are two new Cu–Pb–Bi sulfosalts, found in quartz veins of the Felbertal scheelite deposit, Salzburg Province, Austria. Both occur as rare elongate homogeneous crystals, up to 0.3 mm long and 0.1 mm in diameter, and as lamellae in exsolution pairs. The associated minerals are: bismuthinite derivatives in the range bismuthinite–krupkaite, Ag-bearing lillianite, makovickyite, pavonite, cosalite, cannizzarite, tetradymite, native bismuth, chalcopyrite and pyrite. Salzburgite and paarite are opaque, with a metallic luster and a greyish black streak. In reflected light, they have a greyish white color with distinct anisotropy and perceptible bireflectance in air and oil, without internal reflections. Reflectance data are supplied. Microhardness VHN50–100 is in the range 2.04–2.46 kg/mm2. The average composition of salzburgite is: Cu 4.65, Fe 0.05, Pb 15.97, Bi 61.58, S 17.79, total 100.04 wt.%, from which an empirical formula Cu1.60 Pb1.64 Bi6.38 S11.97 (on the basis of Bi + [(Pb + Cu)/2] = 8 atoms) can be derived. The calculated density is 6.904 g/cm3. The strongest eight lines in the calculated X-ray powder pattern [d in Å(I)(hkl)] are: 4.015(57)(082), 3.631(100)(043), 3.586(55)(141), 3.552(86)(0.12.1), 3.156(57)( 142), 3.136(93)(181), 2.836(94)(182) and 2.560(43)(084). The average composition of paarite is: Cu 4.79, Fe 0.08, Pb 16.74, Bi 60.76, S 17.83, total 100.2 wt.%, from which an empirical formula Cu1.66Pb1.71Bi6.31S12.03 (on the same basis) can be derived. The calculated density is 6.944 g/cm3. The strongest eight lines in the calculated X-ray powder pattern are: 4.014(56)(0.10.2), 3.630(100)(053), 3.585(55)(141), 3.551(85)(0.15.1), 3.155(57)(152), 3.136(92)(1.10.1), 2.836(93)(1.10.2) and 2.560(41)(0.10.4). Salzburgite and paarite are new superstructures of the bismuthinite–aikinite series with a periodicity of order equal to a four-fold, and five-fold multiple, respectively, of the bismuthinite substructure motif.
Keywords: salzburgite, paarite, sulfosalt, new mineral species, bismuthinite–aikinite series, Felbertal, Austria.
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