Abstract
Thalhammerite, Pd9Ag2Bi2S4, is a new sulphide discovered in galena-pyrite-chalcopyrite and millerite-bornite-chalcopyrite vein-disseminated ores from the Komsomolsky mine of the Talnakh and Oktyabrsk deposits, Noril’sk region, Russia. It forms tiny inclusions (from a few μm up to about 40–50 μm) intergrown in galena, chalcopyrite, and also in bornite. Thalhammerite is brittle and has a metallic lustre. In plane-polarized light, thalhammerite is light yellow with weak bireflectance, weak pleochroism, in shades of slightly yellowish brown and weak anisotropy; it exhibits no internal reflections. Reflectance values of thalhammerite in air (R1, R2 in %) are: 41.9/43.0 at 470 nm, 43.9/45.1 at 546 nm, 44.9/46.1 at 589 nm, and 46.3/47.5 at 650 nm. Three spot analyses of thalhammerite give an average composition: Pd 52.61, Bi 22.21, Pb 3.92, Ag 14.37, S 7.69, and Se 0.10, total 100.90 wt %, corresponding to the empirical formula Pd8.46Ag2.28(Bi1.82Pb0.32)Σ2.14(S4.10Se0.02)Σ4.12 based on 17 atoms; the average of five analyses on synthetic thalhammerite is: Pd 55.10, Bi 24.99, Ag 12.75, and S 7.46, total 100.30 wt %, corresponding to Pd8.91Ag2.03Bi2.06S4.00. The density, calculated on the basis of the empirical formula, is 9.72 g/cm3. The mineral is tetragonal, space group I4/mmm, with a 8.0266(2), c 9.1531(2) Å, V 589.70(2) Å3 and Z = 2. The crystal structure was solved and refined from the single-crystal X-ray-diffraction data of synthetic Pd9Ag2Bi2S4. Thalhammerite has no exact structural analogues known in the mineral system; chemically, it is close to coldwellite (Pd3Ag2S) and kravtsovite (PdAg2S). The strongest lines in the X-ray powder diffraction pattern of synthetic thalhammerite [d in Å (I) (hkl)] are: 3.3428(24)(211), 2.8393(46)(220), 2.5685(21)(301), 2.4122(100)(222), 2.3245(61)(123), 2.2873(48)(004), 2.2201(29)(132), 2.0072(40)(400), 1.7481(23)(332), and 1.5085(30)(404). The mineral honours Associate Professor Oskar Thalhammer of the University of Leoben, Austria.
Highlights
Thalhammerite, ideally Pd9 Ag2 Bi2 S4, was observed in the same holotype specimen as kravtsovite, PdAg2 S [1], and vymazalováite, Pd3 Bi2 S2 [2]
2018, 8, x mineralization is characterized by lack of Ni minerals and high galena
The in diopside-monticellite skarns below the lower exocontact of the Talnakh intrusion
Summary
Thalhammerite, ideally Pd9 Ag2 Bi2 S4 , was observed in the same holotype specimen as kravtsovite, PdAg2 S [1], and vymazalováite, Pd3 Bi2 S2 [2]. Minerals 2018, 8, 339 vein-disseminated pyrite-chalcopyrite-galena ore from the Komsomolsky mine in the Talnakh deposit of the Noril’sk district, Russia. Thalhammerite, in host pyrite-chalcopyrite-galena ores, occurs in an associationmine). The rocks of pyrite-chalcopyrite-galena ore in association with cooperite, braggite, vysotskite, stibiopalladinite, telargpalite, sobolevskite,skarns kotulskite, are diopside-hydrogrosssular-serpentine metasomatites developed in diopside-monticellite sopcheite, kravtsovite, vymazalováite, Au-Ag sulphides,mine). Pyrite-chalcopyrite-galenaThe ores,mineral occurs in association with cooperite, braggite, sulphoselenides, and was observed in vein-disseminated vysotskite, stibiopalladinite,ore telargpalite, sopcheite, kravtsovite, millerite-bornite-chalcopyrite from the sobolevskite, Talnakh andkotulskite, Oktyabrsk depositsinsizwaite, of the Noril’sk region [3]. The host rocks of millerite-bornite-chalcopyrite ore are pyroxene-hornfels at the lower exocontact tellurosulphoselenides. 1956) Associate Professor at the University of Leoben, Austria and Classification of the International Mineralogical Association (IMA No 2017-111) The mineral for his contributions to the ore mineralogy andAssociate mineral Professor deposits at ofthe platinum group elements.
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