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@article{1817059,
author = {Makovicky, Emil and Plášil, Jakub and Kasatkin, Anatoly V. and Škoda, Radek},
article_number = {3},
doi = {http://dx.doi.org/10.3749/canmin.2000093},
keywords = {chabourneite; sulfosalt; homeotypic group; endmember; Vorontsovskoe gold deposit},
language = {eng},
issn = {0008-4476},
journal = {Canadian Mineralogist},
title = {The crystal structure of Tl2.36Sb5.98As4.59S17, the lead-free endmember of the chabournéite homeotypic group},
url = {https://pubs.geoscienceworld.org/canmin/article/59/3/533/606476/The-crystal-structure-of-Tl2-36Sb5-98As4-59S17-the},
volume = {59},
year = {2021}
}
TY - JOUR
ID - 1817059
AU - Makovicky, Emil - Plášil, Jakub - Kasatkin, Anatoly V. - Škoda, Radek
PY - 2021
TI - The crystal structure of Tl2.36Sb5.98As4.59S17, the lead-free endmember of the chabournéite homeotypic group
JF - Canadian Mineralogist
VL - 59
IS - 3
SP - 533-549
EP - 533-549
PB - Mineralogical Association of Canada
SN - 00084476
KW - chabourneite
KW - sulfosalt
KW - homeotypic group
KW - endmember
KW - Vorontsovskoe gold deposit
UR - https://pubs.geoscienceworld.org/canmin/article/59/3/533/606476/The-crystal-structure-of-Tl2-36Sb5-98As4-59S17-the
N2 - The crystal structure of Tl2.36Sb5.98As4.59S17, the lead-free endmember of the chabourneite homeotypic group, from the Tl-As-Sb-rich gold deposit at Vorontsovskoye (the Urals, Russia) was determined and refined to R(obs) 0.099 for 9340 unique observed X-ray reflections. The triclinic unit-cell parameters determined from single-crystal data are as follows: alpha = 8.63253(19) angstrom, b= 16.3055(7) angstrom, c= 21.8196(8) angstrom, alpha = 75.094 (3)degrees, beta = 83.631(2)degrees, gamma = 89.303 (2)degrees, V= 2949.18(18) angstrom(3) (Z= 4), space group P (1) over bar. The crystal structure is composed of (001) slabs based on PbS and SnS archetypes, arranged in regular alternation. All Sb(As) coordination polyhedra are (Sb,As)S3+2+(1 or 2) coordination pyramids, in the majority of cases with a mixed Sb-As occupancy in both slab types. Bond-length distributions were studied in detail. The zig-zag boundary between the slabs is composed of a repeating sequence of [100] Tl-Tl, Sb-Sb (1/3 substituted by As), Tl-Tl, and Tl-Sb columns. Thallium forms tricapped trigonal coordination prisms and (Sb,As) forms bicapped prisms. Differences compared to two related structures-parapierrotite and tsygankoite-are specified. Twinning of chabourneite is connected with the (imperfect) order-disorder character of the structure, which is connected with the configurations observed on slab boundaries. The structure refinement of the lead-free Tl-(Sb,As) chabourneite endmember presented in this paper is the best starting point for a restudy of all complexities of the chabourneite homeotypic group.
ER -
MAKOVICKY, Emil, Jakub PLÁŠIL, Anatoly V. KASATKIN a Radek ŠKODA. The crystal structure of Tl2.36Sb5.98As4.59S17, the lead-free endmember of the chabournéite homeotypic group. \textit{Canadian Mineralogist}. Mineralogical Association of Canada, 2021, roč.~59, č.~3, s.~533-549. ISSN~0008-4476. Dostupné z: https://dx.doi.org/10.3749/canmin.2000093.
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