SUBSILICIC FERRIAN ALUMINIAN DIOPSIDE FROM THE CHELYABINSK COAL BASIN (SOUTHERN URALS) - AN UNUSUAL CLINOPYROXENE
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dc.contributor.author | Kabalov Y.K. | |
dc.contributor.author | Sokolova E.V. | |
dc.contributor.author | Oeckler O. | |
dc.contributor.author | Mironov A.B. | |
dc.contributor.author | Chesnokov B.V. | |
dc.date.accessioned | 2020-12-24T03:35:23Z | |
dc.date.available | 2020-12-24T03:35:23Z | |
dc.date.issued | 1997 | |
dc.identifier | https://elibrary.ru/item.asp?id=13272988 | |
dc.identifier.citation | European Journal of Mineralogy, 1997, , 3, 617-621 | |
dc.identifier.uri | https://repository.geologyscience.ru/handle/123456789/21201 | |
dc.description.abstract | The crystal structure of a technogeneous Fe3+-rich diopside from the Chelyabinsk coal basin, Southern Urals, has been refined from X-ray powder diffraction data (CoKα, radiation) using the Rietveld method (Rwp = 0.049). The refined monoclinic cell dimensions (Z = 4, space group C2/c) are a = 9.786(2) Å, b = 8.860(1) Å, c = 5.338(1) Å and β = 105.87(1)°. This technogeneous mineral has previously been described as esseneite according to the empirical formula Ca1.00Fe3+0.51Ti0.02Al 0.60Si1.43O6, but in contrast to ideal esseneite (end member: CaFe3+AlSiO6), Fe3+ ions are not restricted to the octahedral M(1) site, but are partitioned between the M(1) and the tetrahedral T site. Moessbauer spectroscopy indicates a Fe3+ distribution over the M(1) and T sites with a 2:1 ratio. Site occupancy refinement confirms that the M(1) site is occupied by 0.44(3) Mg, 0.35(3) Fe3+ and 0.20(3) Al, and the T site by 0.70(2) Si, 0.20(2) Al and 0.08(2) Fe3+. | |
dc.title | SUBSILICIC FERRIAN ALUMINIAN DIOPSIDE FROM THE CHELYABINSK COAL BASIN (SOUTHERN URALS) - AN UNUSUAL CLINOPYROXENE | |
dc.type | Статья |
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