Telluronevskite, Bi₃TeSe₂, a new mineral

Authors: Rcaron ídko scaron il, Tomas¹; Skála, Roman²; Johan, Zden ecaron k³; Scaron rein, Vladimir⁴

Source: European Journal of Mineralogy, Volume 13, Number 1, 1 February 2001 , pp. 177-185(9)

Publisher: E. Schweizerbart'sche Verlagsbuchhandlung

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Abstract:

The new mineral telluronevskite, ideally Bi₃TeSe₂, has been found as irregular grains disseminated in quartzite from the volcanic Vihorlat Mts near Ko scaron

ice 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 P3¯m1. 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/I ₀, 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.

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Keywords: TELLURONEVSKITE; NEW MINERAL; TSUMOITE SUBGROUP; TETRADYMITE GROUP; CRYSTAL STRUCTURE; BISMUTH SELENIDE TELLURIDE; VIHORLAT MTS; SLOVAKIA

Document Type: Research article

DOI: http://dx.doi.org/10.1127/0935-1221/01/0013-0177

Affiliations: 1: Dept. of Mineralogy, OM Ccaron R, Skálova 71, CZ-51101 Turnov, Czech Republic R, 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 Orlfians Cedex 2, France 4: Institute of Rock Structure and Mechanics, Czech Academy of Sciences, V Hole scaron ovi ccaron kách 41, CZ-18000 Praha 8, Czech Republicovi ccaron kách 41, CZ-18000 Praha 8, Czech Republic">