Nafertisite, Na3Fe2+ 10Ti2(Si6O17)2O2(OH)6F(H2O)2, from Mt. Kukisvumchorr, khibiny alkaline massif, kola peninsula, Russia: Refinement of the crystal structure and revision of the chemical formula
The crystal structure of nafertisite, Na3Fe102+Ti2(Si6O17)(2)O-2(OH)(6)F(H2O)(2), from Mt. Kulcisvumchorr, Khibiny alkaline massif, Kola peninsula, Russia, a 5.358(1), b 16.204(3), c 21.976(4) angstrom, beta 94.91(1)degrees, V 1901.0(7) angstrom(3), space group A2/m, Z = 2, D-calc. 3.116 g/cm(3), ha...
Published in: | European Journal of Mineralogy |
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ftunivtorino:oai:iris.unito.it:2318/152683 2023-10-29T02:37:41+01:00 Nafertisite, Na3Fe2+ 10Ti2(Si6O17)2O2(OH)6F(H2O)2, from Mt. Kukisvumchorr, khibiny alkaline massif, kola peninsula, Russia: Refinement of the crystal structure and revision of the chemical formula CAMARA ARTIGAS, Fernando Sokolova E Abdu Y Hawthorne FC Cámara F Sokolova E Abdu Y Hawthorne FC 2014 STAMPA http://hdl.handle.net/2318/152683 https://doi.org/10.1127/0935-1221/2014/0026-2401 https://www.schweizerbart.de/journals/ejm eng eng info:eu-repo/semantics/altIdentifier/wos/WOS:000343780600008 volume:26 issue:5 firstpage:689 lastpage:700 numberofpages:12 journal:EUROPEAN JOURNAL OF MINERALOGY http://hdl.handle.net/2318/152683 doi:10.1127/0935-1221/2014/0026-2401 info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-84910073642 https://www.schweizerbart.de/journals/ejm info:eu-repo/semantics/closedAccess nafertisite structure refinement Mossbauer spectroscopy FTIR spectroscopy Raman Spectroscopy electron microprobe analysis info:eu-repo/semantics/article 2014 ftunivtorino https://doi.org/10.1127/0935-1221/2014/0026-2401 2023-10-03T22:22:02Z The crystal structure of nafertisite, Na3Fe102+Ti2(Si6O17)(2)O-2(OH)(6)F(H2O)(2), from Mt. Kulcisvumchorr, Khibiny alkaline massif, Kola peninsula, Russia, a 5.358(1), b 16.204(3), c 21.976(4) angstrom, beta 94.91(1)degrees, V 1901.0(7) angstrom(3), space group A2/m, Z = 2, D-calc. 3.116 g/cm(3), has been refined to an R-1 value of 5.60 % for 2747 observed [F-o > 4 sigma F] unique reflections collected with a single-crystal diffractometer. The crystal used in the collection of the X-ray intensity data was analyzed by electron microprobe; the Fe3+/(Fe2++Fe3+) ratio was measured by Mossbauer spectroscopy, and FTIR and Raman spectra were collected. The empirical formula was calculated on the basis of (O + F + OH + H2O) = 44.39 pfu: (Na1.39K0.61)(Sigma 2)Na-1(Rb0.06Cs0.02 square(0.921))(Sigma 1)(Fe9.112+Mg0.46Mn0.22Al0.10Na0.09Ca0.02)(Sigma 10)(Ti1.90Nb0.05Mg0.03Zr0.02)(Sigma 2)[(Si11.81Al0.19)(Sigma 12)O-34]O-2(OH)(6) (F0.86O0.14)(Sigma 1)(H2O)(1.39); Z = 2; the content of H2O was calculated from the structure-refinement results. The HOH layer is the main structural unit in nafertisite. It consists of a central octahedral (O) sheet and two adjacent heteropolyhedral (H) sheets. The O sheet is composed of Fe2+-dominant M(1-3) octahedra, the M(1-3) sites are fully occupied and the ideal composition of the O sheet is Fe-10(2+) apfu. The H sheet is composed of the nafertisite T6O17 ribbons and Ti-dominant D octahedra. The chemical composition of the nafertisite ribbon is (Si11.81Al0.19)O-34 apfu, ideally (Si6O17)(2)pfu. In the crystal structure of nafertisite, HOH layers alternate with intermediate (I) blocks along c. In the I block, the A, B, C and W sites are occupied by (Na1.39K0.61), Na, (square 0.92Rb0.06Cs0.02) and [(H2O)(1.39)square(0.61)] Pfu, respectively. The chemical composition of the I block of the general formula A(2)BCW is [(Na-1.39 K-0.61)Na-1(square 0.92Rb0.06Cs0.02(H2O)(1.39)] pfu, ideally Na-3(H2O)(2) pfu. Nafertisite is closely related to the astrophyllite-group minerals. Article in Journal/Newspaper kola peninsula Università degli studi di Torino: AperTo (Archivio Istituzionale ad Accesso Aperto) European Journal of Mineralogy 26 5 689 700 |
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Open Polar |
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Università degli studi di Torino: AperTo (Archivio Istituzionale ad Accesso Aperto) |
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ftunivtorino |
language |
English |
topic |
nafertisite structure refinement Mossbauer spectroscopy FTIR spectroscopy Raman Spectroscopy electron microprobe analysis |
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nafertisite structure refinement Mossbauer spectroscopy FTIR spectroscopy Raman Spectroscopy electron microprobe analysis CAMARA ARTIGAS, Fernando Sokolova E Abdu Y Hawthorne FC Nafertisite, Na3Fe2+ 10Ti2(Si6O17)2O2(OH)6F(H2O)2, from Mt. Kukisvumchorr, khibiny alkaline massif, kola peninsula, Russia: Refinement of the crystal structure and revision of the chemical formula |
topic_facet |
nafertisite structure refinement Mossbauer spectroscopy FTIR spectroscopy Raman Spectroscopy electron microprobe analysis |
description |
The crystal structure of nafertisite, Na3Fe102+Ti2(Si6O17)(2)O-2(OH)(6)F(H2O)(2), from Mt. Kulcisvumchorr, Khibiny alkaline massif, Kola peninsula, Russia, a 5.358(1), b 16.204(3), c 21.976(4) angstrom, beta 94.91(1)degrees, V 1901.0(7) angstrom(3), space group A2/m, Z = 2, D-calc. 3.116 g/cm(3), has been refined to an R-1 value of 5.60 % for 2747 observed [F-o > 4 sigma F] unique reflections collected with a single-crystal diffractometer. The crystal used in the collection of the X-ray intensity data was analyzed by electron microprobe; the Fe3+/(Fe2++Fe3+) ratio was measured by Mossbauer spectroscopy, and FTIR and Raman spectra were collected. The empirical formula was calculated on the basis of (O + F + OH + H2O) = 44.39 pfu: (Na1.39K0.61)(Sigma 2)Na-1(Rb0.06Cs0.02 square(0.921))(Sigma 1)(Fe9.112+Mg0.46Mn0.22Al0.10Na0.09Ca0.02)(Sigma 10)(Ti1.90Nb0.05Mg0.03Zr0.02)(Sigma 2)[(Si11.81Al0.19)(Sigma 12)O-34]O-2(OH)(6) (F0.86O0.14)(Sigma 1)(H2O)(1.39); Z = 2; the content of H2O was calculated from the structure-refinement results. The HOH layer is the main structural unit in nafertisite. It consists of a central octahedral (O) sheet and two adjacent heteropolyhedral (H) sheets. The O sheet is composed of Fe2+-dominant M(1-3) octahedra, the M(1-3) sites are fully occupied and the ideal composition of the O sheet is Fe-10(2+) apfu. The H sheet is composed of the nafertisite T6O17 ribbons and Ti-dominant D octahedra. The chemical composition of the nafertisite ribbon is (Si11.81Al0.19)O-34 apfu, ideally (Si6O17)(2)pfu. In the crystal structure of nafertisite, HOH layers alternate with intermediate (I) blocks along c. In the I block, the A, B, C and W sites are occupied by (Na1.39K0.61), Na, (square 0.92Rb0.06Cs0.02) and [(H2O)(1.39)square(0.61)] Pfu, respectively. The chemical composition of the I block of the general formula A(2)BCW is [(Na-1.39 K-0.61)Na-1(square 0.92Rb0.06Cs0.02(H2O)(1.39)] pfu, ideally Na-3(H2O)(2) pfu. Nafertisite is closely related to the astrophyllite-group minerals. |
author2 |
Cámara F Sokolova E Abdu Y Hawthorne FC |
format |
Article in Journal/Newspaper |
author |
CAMARA ARTIGAS, Fernando Sokolova E Abdu Y Hawthorne FC |
author_facet |
CAMARA ARTIGAS, Fernando Sokolova E Abdu Y Hawthorne FC |
author_sort |
CAMARA ARTIGAS, Fernando |
title |
Nafertisite, Na3Fe2+ 10Ti2(Si6O17)2O2(OH)6F(H2O)2, from Mt. Kukisvumchorr, khibiny alkaline massif, kola peninsula, Russia: Refinement of the crystal structure and revision of the chemical formula |
title_short |
Nafertisite, Na3Fe2+ 10Ti2(Si6O17)2O2(OH)6F(H2O)2, from Mt. Kukisvumchorr, khibiny alkaline massif, kola peninsula, Russia: Refinement of the crystal structure and revision of the chemical formula |
title_full |
Nafertisite, Na3Fe2+ 10Ti2(Si6O17)2O2(OH)6F(H2O)2, from Mt. Kukisvumchorr, khibiny alkaline massif, kola peninsula, Russia: Refinement of the crystal structure and revision of the chemical formula |
title_fullStr |
Nafertisite, Na3Fe2+ 10Ti2(Si6O17)2O2(OH)6F(H2O)2, from Mt. Kukisvumchorr, khibiny alkaline massif, kola peninsula, Russia: Refinement of the crystal structure and revision of the chemical formula |
title_full_unstemmed |
Nafertisite, Na3Fe2+ 10Ti2(Si6O17)2O2(OH)6F(H2O)2, from Mt. Kukisvumchorr, khibiny alkaline massif, kola peninsula, Russia: Refinement of the crystal structure and revision of the chemical formula |
title_sort |
nafertisite, na3fe2+ 10ti2(si6o17)2o2(oh)6f(h2o)2, from mt. kukisvumchorr, khibiny alkaline massif, kola peninsula, russia: refinement of the crystal structure and revision of the chemical formula |
publishDate |
2014 |
url |
http://hdl.handle.net/2318/152683 https://doi.org/10.1127/0935-1221/2014/0026-2401 https://www.schweizerbart.de/journals/ejm |
genre |
kola peninsula |
genre_facet |
kola peninsula |
op_relation |
info:eu-repo/semantics/altIdentifier/wos/WOS:000343780600008 volume:26 issue:5 firstpage:689 lastpage:700 numberofpages:12 journal:EUROPEAN JOURNAL OF MINERALOGY http://hdl.handle.net/2318/152683 doi:10.1127/0935-1221/2014/0026-2401 info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-84910073642 https://www.schweizerbart.de/journals/ejm |
op_rights |
info:eu-repo/semantics/closedAccess |
op_doi |
https://doi.org/10.1127/0935-1221/2014/0026-2401 |
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European Journal of Mineralogy |
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26 |
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