Инд. авторы:	Avdontceva M.S., Zolotarev A.A., Krivovichev S.V., Krzhizhanovskaya M.G., Sokol E.V., Kokh S.N., Bocharov V.N., Rassomakhin M.A., Zolotarev A.A.
Заглавие:	Fluorellestadite from burned coal dumps: crystal structure refinement, vibrational spectroscopy data and thermal behavior
Библ. ссылка:	Avdontceva M.S., Zolotarev A.A., Krivovichev S.V., Krzhizhanovskaya M.G., Sokol E.V., Kokh S.N., Bocharov V.N., Rassomakhin M.A., Zolotarev A.A. Fluorellestadite from burned coal dumps: crystal structure refinement, vibrational spectroscopy data and thermal behavior // Mineralogy and Petrology. - 2021. - ISSN 0930-0708. - EISSN 1438-1168.
Внешние системы:	DOI: 10.1007/s00710-021-00740-4; РИНЦ: 46754708; WoS: 000619447800002;
Реферат:	eng: Nine different samples of fluorellestadite from Chelyabinsk, Kizel and Kuznetsk coal basins were studied by single-crystal X-ray diffraction analysis, thermal X-ray diffraction (25-800 degrees C), Infrared (IR) and Raman spectroscopy. Fluorellestadite is hexagonal, space group P6(3)/m, the unit-cell parameters for the nine samples studied vary within rather small ranges: a = 9.415(5) - 9.4808(7) angstrom, c = 6.906(2) - 6.938(8) angstrom, V = 530.3(4) - 538.41(9) angstrom(3). The mineral is isotypic with apatite, the structure is based upon isolated TO4 tetrahedra, where the T position is statistically occupied by Si4+ and S6+ with the ideal ratio Si:S equal to 1:1. The fluorine atoms are located in channels of the Ca-4[(S,Si)O-4](6) framework oriented parallel to the c axis. The thermal expansion of fluorellestadite is almost isotropic in the temperature range 25-800 degrees C (for ambient temperature: alpha(a) = 12.0 center dot 10(-6) degrees C-1, alpha(c) = 11.9 center dot 10(-6) degrees C-1; for 800 degrees C: alpha(a) = 18.2 center dot 10(-6) degrees C-1, alpha(c) = 18.6 center dot 10(-6) degrees C-1). A similar thermal behavior had been observed for fluorapatite. Despite the same structure motifs and close conditions of formation, the samples of fluorellestadite show different S/Si/P occupancies for T site and the F/Cl/OH (X-position) ratios.
Ключевые слова:	Chelyabinsk coal basin; technogenic (anthropogenic) mineralogy; burned coal dumps; apatite supergroup; Fluorellestadite;
Издано:	2021
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