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dc.contributor.author | Aksenov S. | |
dc.contributor.author | Chukanov N. | |
dc.contributor.author | Rusakov V. | |
dc.contributor.author | Panikorovskii T. | |
dc.contributor.author | Rastsvetaeva R. | |
dc.contributor.author | Gainov R. | |
dc.contributor.author | Vagizov F. | |
dc.contributor.author | Lyssenko K. | |
dc.contributor.author | Belakovskiy D. | |
dc.date.accessioned | 2018-09-19T22:40:59Z | |
dc.date.available | 2018-09-19T22:40:59Z | |
dc.date.issued | 2016 | |
dc.identifier.issn | 2052-5192 | |
dc.identifier.uri | https://dspace.kpfu.ru/xmlui/handle/net/145359 | |
dc.description.abstract | © 2016 International Union of Crystallography.Vesuvianite containing 5.85 wt% TiO2 from an Alpine-cleft-type assemblage outcropped near Alchuri, Shigar Valley, Northern Areas, Pakistan, has been investigated by means of electron microprobe analyses, gas-chromatographic analysis of H2O, X-ray powder diffraction, single-crystal X-ray structure refinement, 27Al NMR, 57Fe Mössbauer spectroscopy, IR spectroscopy and optical measurements. Tetragonal unit-cell parameters are: a = 15.5326 (2), c = 11.8040 (2) Å, space group P4/nnc. The structure was refined to final R1 = 0.031, wR2 = 0.057 for 11247 I > 2σ(I). A general crystal-chemical formula of studied sample can be written as follows (Z = 2): [8-9](Ca17.1Na0.9) [8]Ca1.0[5](Fe2+ 0.44Fe3+ 0.34Mg0.22) [6](Al3.59Mg0.41) [6](Al4.03Ti2.20Fe3+1.37Fe2+ 0.40) (Si18O68) [(OH)5.84O2.83F1.33]. The octahedral site Y2 is Al-dominant and does not contain transition elements. Another octahedral site Y3 is also Al-dominant and contains Fe2+, Fe3+ and Ti. The site Y1 is split into Y1a and Y1b predominantly occupied by Fe2+ and Fe3+, respectively. The role of the Y1 site in the diversity of vesuvianite-group minerals is discussed. | |
dc.relation.ispartofseries | Acta Crystallographica Section B: Structural Science, Crystal Engineering and Materials | |
dc.subject | 27 Al NMR NMR spectroscopy | |
dc.subject | crystal chemistry | |
dc.subject | IR spectroscopy | |
dc.subject | Mössbauer spectroscopy | |
dc.subject | vesuvianite | |
dc.title | Towards a revisitation of vesuvianite-group nomenclature: The crystal structure of Ti-rich vesuvianite from Alchuri, Shigar Valley, Pakistan | |
dc.type | Article | |
dc.relation.ispartofseries-volume | 72 | |
dc.collection | Публикации сотрудников КФУ | |
dc.relation.startpage | 744 | |
dc.source.id | SCOPUS20525192-2016-72-SID84990047401 |