| Reference Type | Journal (article/letter/editorial) |
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| 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 |
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| Journal | European Journal of Mineralogy |
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| Authors | Cámara, Fernando | Author |
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| Sokolova, Elena | Author |
| Abdu, Yassir A. | Author |
| Hawthorne, Frank C. | Author |
| Year | 2014 (October 17) | Volume | 26 |
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| Issue | 5 |
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| Publisher | Schweizerbart |
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| Download URL | https://rruff.info/rruff_1.0/uploads/EJM26_689.pdf+ |
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| DOI | doi:10.1127/0935-1221/2014/0026-2401Search in ResearchGate |
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| Generate Citation Formats |
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| Classification | Not set | LoC | Not set |
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| Mindat Ref. ID | 129356 | Long-form Identifier | mindat:1:5:129356:6 |
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| GUID | 0 |
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| Full Reference | Cámara, Fernando, Sokolova, Elena, Abdu, Yassir A., Hawthorne, Frank C. (2014) 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. European Journal of Mineralogy, 26 (5) 689-700 doi:10.1127/0935-1221/2014/0026-2401 |
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| Plain Text | Cámara, Fernando, Sokolova, Elena, Abdu, Yassir A., Hawthorne, Frank C. (2014) 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. European Journal of Mineralogy, 26 (5) 689-700 doi:10.1127/0935-1221/2014/0026-2401 |
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| In | (2014, October) European Journal of Mineralogy Vol. 26 (5) Schweizerbart |
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| Abstract/Notes | The crystal structure of nafertisite, Na3Fe2+ 10Ti2(Si6O17)2O2(OH)6F(H2O)2, from Mt. Kukisvumchorr, Khibiny alkaline massif, Kola peninsula, Russia, a 5.358(1), b 16.204(3), c 21.976(4) Å, β 94.91(1)˚, V 1901.0(7) Å3, space group A2/m, Z = 2, D calc. 3.116 g/cm3, has been refined to an R 1 value of 5.60 % for 2747 observed [F o > 4σF] 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 Mössbauer 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)Σ2Na1(Rb0.06Cs0.02〈0.92)Σ1(Fe2+ 9.11Mg0.46Mn0.22Al0.10Na0.09Ca0.02)Σ10(Ti1.90Nb0.05Mg0.03Zr0.02)Σ2[(Si11.81Al0.19)Σ12O34]O2(OH)6(F0.86O0.14)Σ1(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 Fe2+ 10 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)O34 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, (〈0.92Rb0.06Cs0.02) and [(H2O)1.39〈0.61] pfu, respectively. The chemical composition of the Iblock of the general formula A2BCW is [(Na1.39K0.61)Na1(〈0.92Rb0.06Cs0.02)(H2O)1.39] pfu, ideally Na3(H2O)2 pfu. Nafertisite is closely related to the astrophyllite-group minerals. |
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