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THE CRYSTAL STRUCTURE OF EMILITE, Cu_10.7Pb_10.7Bi_21.3S₄₈, THE SECOND 45 Å DERIVATIVE OF THE BISMUTHINITE–AIKINITE SOLID-SOLUTION SERIES

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

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

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

The crystal structure of the new mineral species emilite, discovered in the Felbertal scheelite deposit, Austria [Cu_10.7Pb_10.7Bi_21.3S₄₈, Pmc2₁, a 4.0285(8), b 44.986(9), c 11.599(2) Å], reveals it to be a new 45 Å member of the bismuthinite – krupkaite – aikinite solid-solution series. A refinement of the crystal structure was made with single-crystal measurements, which included 2943 observed unique reflections (I > 2_I) and resulted in R₁ = 6.6% (R_W = 22.4%). The crystal structure is composed of a fairly complex sequence of krupkaite-like and aikinite-like structure intervals. Emilite is structurally an analogue of the only other 45 Å member of the series, salzburgite (Cu_6.4Pb_6.4Bi_25.6S₄₈). Where one structure has [001] rows of Cu-filled tetrahedra, the other has empty or half-empty tetrahedra, and vice versa. The oversubstitution of Cu in the krupkaite-like intervals in the structure causes a departure from an idealized Cu₁₀Pb₁₀Bi₂₂S₄₈ composition and might be required by a metric fit between the krupkaite and aikinite modules in the structure and thus be a prerequisite for its stabilization.

Keywords: emilite, Cu_10.7Pb_10.7Bi_21.3S₄₈, aikinite–bismuthinite derivative, crystal structure, Felbertal, scheelite deposit, Austria.

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