Abstract
Abstract Grains of the bowieite–kashinite solid-solution series were characterized by electron microprobe analysis, single-crystal X-ray diffraction, and Raman spectroscopy. The grains were recovered from dunitic rocks located in the Svetly Bor Ural-Alaskan type massif, Urals, Russia. Bowieite and kashinite occur as small inclusions (up to 100 μm in size) in isoferroplatinum grains up to 1 mm in diameter. Single-crystal X-ray diffraction data for two selected grains, with compositions (Rh 1.16 Ir 0.82 Cu 0.02 ) Σ2.00 S 3.00 and (Ir 1.06 Rh 0.87 Cu 0.04 ) Σ1.97 S 3.03 , confirm that the minerals are orthorhombic with similar cell dimensions: a 8.46(1), b 6.00(1), c 6.14(1) A for bowieite, and a 8.46(1), b 5.99(1), c 6.14(1) A for kashinite. The Raman spectra of the same two single grains show similar characteristic bands. One grain with composition (Ir 0.26 Rh 0.13 Pt 0.12 Ni 0.18 Cu 0.18 Fe 0.11 ) Σ0.98 S was found associated with the kashinite. It shows a distinctive Raman spectrum and may represent a new platinum-group mineral, although the small size (less than 20 μm) prevented us from obtaining X-ray diffraction data. Our data for the bowieite–kashinite series are compared with selected worldwide occurrences.
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