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THE CRYSTAL STRUCTURE OF PAARITE, THE NEWLY DISCOVERED 56 Å DERIVATIVE OF THE BISMUTHINITE–AIKINITE SOLID-SOLUTION SERIES

Emil Makovicky, Dan Topa^¶ and Toni Bali-uni

Geological Institute, University of Copenhagen, Øster Voldgade 10, DK-1350 Copenhagen K, Denmark

E-mail address: emilm{at}geo.geol.ku.dk

We have determined the crystal structure of paarite, a newly discovered 56 Å derivative of the bismuthinite–aikinite series from the metamorphosed scheelite deposit of Felbertal, Austria. Its electron-microprobe-established composition is Cu_1.7Pb_1.7Bi_6.3S₁₂, and the structure-derived composition is Cu_1.6Pb_1.6Bi_6.4S₁₂, with a 4.007(1), b 55.998(8), c 11.512(2) Å, space group Pmcn, Z = 5. The structure has been solved by direct methods and difference-Fourier syntheses, and refined to a residual value R₁ of ~7.0%. The unit cell of this "fivefold derivative" contains two "bismuthinite-like" Bi₄S₆ ribbons and eight "krupkaite-like" CuPbBi₃S₆ ribbons. The fully occupied Cu sites occur in zigzag [001] rows at y = 0.15, 0.30, 0.70 and 0.85, comprising gladite-like and krupkaite-like intervals in the structure in regular 1:1 alternation. Coordination polyhedra have been analyzed using the polyhedron-distortion parameters devised recently by Bali-uni & Makovicky, and comparisons to the structures of salzburgite and lindströmite are given. This new derivative occurs at Felbertal both as independent grains and as a component of exsolution pairs with krupkaite.

Keywords: paarite, Cu_1.7Pb_1.7Bi_6.3S₁₂, bismuthinite–aikinite derivative, crystal structure, sulfosalt, Felbertal, scheelite deposit, Austria.

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