Abstract
Batievaite-(Y), Y2Ca2Ti[Si2O7]2(OH)2(H2O)4, is a new mineral found in nepheline syenite pegmatite in the Sakharjok alkaline massif, Western Keivy, Kola Peninsula, Russia. The pegmatite mainly consists of nepheline, albite, alkali pyroxenes, amphiboles, biotite and zeolites. Batievaite-(Y) is a late-pegmatitic or hydrothermal mineral associated with meliphanite, fluorite, calcite, zircon, britholite-group minerals, leucophanite, gadolinite-subgroup minerals, titanite, smectites, pyrochlore-group minerals, zirkelite, cerianite-(Ce), rutile, behoite, ilmenite, apatite-group minerals, mimetite, molybdenite, and nickeline. Batievaite-(Y) is pale-cream coloured with white streak and dull, greasy or pearly luster. Its Mohs hardness is 5–5.5. No cleavage or parting was observed. The measured density is 3.45(5) g/cm3. Batievaite-(Y) is optically biaxial positive, α 1.745(5), β 1.747(5), γ 1.752(5) (λ 589 nm), 2V meas. = 60(5)°, 2V calc. = 65°. Batievaite-(Y) is triclinic, space group P-1, a 9.4024(8), b 5.5623(5), c 7.3784(6) Å, α 89.919(2), β 101.408(2), γ 96.621(2)°, V 375.65(6) Å3 and Z = 1. The eight strongest lines of the X-ray powder diffraction pattern [d(Å)(I)(hkl)] are: 2.991(100)(11-2), 7.238(36)(00-1), 3.061(30)(300), 4.350(23)(0-1-1), 9.145(17)(100), 4.042(16)(11-1), 2.819(16)(3-10), 3.745(13)(2-10). The chemical composition determined by electron probe microanalysis (EPMA) is (wt.%): Nb2O5 2.25, TiO2 8.01, ZrO2 2.72, SiO2 29.96, Al2O3 0.56, Fe2O3 0.43, Y2O3 11.45, La2O3 0.22, Ce2O3 0.33, Nd2O3 0.02, Gd2O3 0.07, Dy2O3 0.47, Er2O3 1.07, Tm2O3 0.25, Yb2O3 2.81, Lu2O3 0.45, CaO 24.98, MnO 1.31, MgO 0.01, Na2O 1.13, K2O 0.02, F 2.88, Cl 0.19, H2O 6.75 (determined on the basis of crystal structure data), O = (F,Cl) −1.25, total 97.09 wt.%. The empirical formula based on the EPMA and single-crystal structure analyses is (Y0.81Ca0.65Mn0.15Zr0.12Yb0.11Er0.04Fe3+ 0.04Ce0.02Dy0.02Lu0.02La0.01Tm0.01)Σ2.00((H2O)0.75Ca0.70□0.55)Σ2.00Ca2.00(□0.61Na0.25( H2O)0.14)Σ1.00(Ti0.76Nb0.15Zr0.09)Σ1.00[(Si3.91Al0.09)Σ4.00O14]((OH)1.56F0.44)Σ2.00((H2O)1.27F0.73)Σ2.00. The infrared spectrum of the mineral contains the following bands (cm−1): 483, 584, 649, 800, 877, 985, 1630, 1646, 1732, 3426. Batievaite-(Y) belongs to the rosenbuschite group minerals and is the Na-deficient Y-analogue of hainite. The mineral is named in honour of the Russian geologist Iya Dmitrievna Batieva (1922–2007) in recognition of her remarkable contribution into the geology and petrology of metamorphic and alkaline complexes of the Kola Peninsula.
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Acknowledgments
The study was supported by the Russian Foundation for Basic Research (grant No. 16-05-00427). AAZ is grateful to President Federation Grant for Young Candidates of Sciences (MK-3296.2015.5). SVK acknowledges financial support from Saint-Petersburg State University (grant # 3.38.136.2014). X-ray diffraction studies were conducted at the XRD Resource Centre of Saint-Petersburg State University. We thank reviewers Fernando Camara, Anthony Robert Kampf and Igor Pekov for their helpful comments.
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Lyalina, L.M., Zolotarev, A.A., Selivanova, E.A. et al. Batievaite-(Y), Y2Ca2Ti[Si2O7]2(OH)2(H2O)4, a new mineral from nepheline syenite pegmatite in the Sakharjok massif, Kola Peninsula, Russia. Miner Petrol 110, 895–904 (2016). https://doi.org/10.1007/s00710-016-0444-4
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DOI: https://doi.org/10.1007/s00710-016-0444-4