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Telluronevskite, Bi₃TeSe₂, a new mineral

Tomá ÍDKOIL¹, Roman SKÁLA², Zdenk JOHAN³ and Vladimír REIN⁴

¹ Dept. of Mineralogy, OMR, Skálova 71, CZ-51101 Turnov, Czech Republic
² Laboratory of X-ray Microanalysis (LAREM), Czech Geological Survey, Klárov 3/131, CZ-11821 Praha 1, Czech Republic.
³ BRGM, 3, avenue Claude Guillemin, BP 6009, F-45060 Orléans Cedex 2, France
⁴ Institute of Rock Structure and Mechanics, Czech Academy of Sciences, V Holeovikách 41, CZ-18000 Praha 8, Czech Republic

e-mail: skala{at}cgu.cz

The new mineral telluronevskite, ideally Bi₃TeSe₂, has been found as irregular grains disseminated in quartzite from the volcanic Vihorlat Mts near Koice in eastern Slovakia, Slovak Republic. The mineral forms massive aggregates up to 2 mm in diameter and/or individual disseminated tabular crystals flattened along (0001). Telluronevskite is megascopically steel grey in colour, with a metallic lustre and black streak. In reflected light, it is white with a yellow tint, very weak pleochroism and moderate anisotropy. Maximum and minimum values of reflectance measured in air for 470, 546, 589 and 650 nm are (R_max/R_min in %): 48.5/46.6; 51.1/48.5; 51.9/49.5; 52.8/50.5. Vickers micro-hardness (VHN₁₀ in kp.mm^–2) varied in the range 63-137 with mean value of 100. Microprobe analyses yield the empirical formula (Bi_2.92Pb_0.02)Te_1.01(Se_1.73S_0.32). It is trigonal with space group P3m1. The unit-cell dimensions refined from X-ray powder microdiffraction data are a = 4.264(6) Å and c = 23.25(3) Å with c : a = 5.453 : 1. For Z = 2 the calculated density is D_x = 8.08(2) g.cm^–3; measured density D_m = 8.1(2) g.cm^–3. The five strongest lines in the diffraction pattern are (d (Å), I/I₀, hkl): 4.66, 19, 005; 3.12, 100, 104; 2.28, 33, 108; 2.13, 36, 110, 109; 1.355, 18, 1.0.16, 214. Constrained structure refinement from combined powder and precession data revealed ordering of Te and Se atoms within the telluronevskite crystal structure. Telluronevskite belongs to the tsumoite subgroup of the tetradymite group.

Key-words: telluronevskite, new mineral, tsumoite subgroup, tetradymite group, crystal structure, bismuth selenide telluride, Vihorlat Mts, Slovakia.

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