Calcium fluorosilicate Ca5(SiO4)2F2 from burnt dumps of the Chelyabinsk coal basin (South Urals): crystal chemistry, spectroscopy, thermal behavior
- Autores: Brazhnikova A.S.1, Zolotarev A.A.1, Avdontсeva M.S.1, Krivovichev S.V.1,2, Krzhizhanovskaya M.G.1, Bocharov V.N.1, Vlasenko N.S.1, Rassomakhin M.A.3
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Afiliações:
- St. Petersburg State University
- Kola Science Center RAS
- South Urals Federal Research Center of Mineralogy and Geoecology of UB RAS
- Edição: Volume 70, Nº 3 (2025)
- Páginas: 363-371
- Seção: КРИСТАЛЛОХИМИЯ
- URL: https://journal-vniispk.ru/0023-4761/article/view/293753
- DOI: https://doi.org/10.31857/S0023476125030026
- EDN: https://elibrary.ru/BEMFDN
- ID: 293753
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Resumo
The anthropogenic calcium fluorosilicate “kutyukhinite” Ca5(SiO4)2F2 from burnt dumps of the Chelyabinsk coal basin has been studied by single crystal and powder X-ray diffraction analyses in a wide temperature range. “Kutyukhinite” (P21/a, a = 11.4985(4), b = 5.0535(2), c = 8.7848(3) Å, β = 109.008(4)°, V = 482.63(3) Å3, R1 = 0.0183) is an anthropogenic analogue of kumtyubeite which belongs to the structural type of chondrodite. The empirical formula of “kutyukhinite” is Ca5.02(Si1.99O7.98)F2.04. Upon heating, its crystal structure expands anisotropically, with the direction of maximum thermal expansion close to the direction [100]. The relative change in bond lengths in silicon-oxygen tetrahedra with increasing temperature (27−927°C) is less than 0.6%, which is within the margin of error. At the same time, the relative increase in the average bond length of the
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Sobre autores
A. Brazhnikova
St. Petersburg State University
Autor responsável pela correspondência
Email: st084249@student.spbu.ru
Rússia, St. Petersburg
A. Zolotarev
St. Petersburg State University
Email: st084249@student.spbu.ru
Rússia, St. Petersburg
M. Avdontсeva
St. Petersburg State University
Email: st084249@student.spbu.ru
Rússia, St. Petersburg
S. Krivovichev
St. Petersburg State University; Kola Science Center RAS
Email: st084249@student.spbu.ru
Rússia, St. Petersburg; Apatity
M. Krzhizhanovskaya
St. Petersburg State University
Email: st084249@student.spbu.ru
Rússia, St. Petersburg
V. Bocharov
St. Petersburg State University
Email: st084249@student.spbu.ru
Rússia, St. Petersburg
N. Vlasenko
St. Petersburg State University
Email: st084249@student.spbu.ru
Rússia, St. Petersburg
M. Rassomakhin
South Urals Federal Research Center of Mineralogy and Geoecology of UB RAS
Email: st084249@student.spbu.ru
Rússia, Miass
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