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Structural characterization and composition of Y-rich hainite from Sakharjok nepheline syenite pegmatite (Kola Peninsula, Russia)

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Abstract

Y-rich hainite occurs in nepheline syenite pegmatite of the Sakharjok massif (Kola Peninsula, Russia). It forms euhedral prismatic crystals up to 2 mm in length as well as rims around an unidentified mineral phase (silicate of Ca, Y, Zr and Ti). The mineral is triclinic, space group P-1, a 9.6054(10), b 5.6928(6), c 7.3344(7) Å, α 89.903(2), β 101.082(2), γ 100.830(2)°, V 386.32(7) Å3, Z = 1. The calculated density is 3.39 g/cm3. Chemical composition of Sakharjok hainite is different from the previously published data by much higher Y and Nb contents up to 0.72 and 0.20 atoms per formula unit, respectively, by the two- to five-fold depletion in the LREEs and by the strong enrichment of the HREEs. From the single-crystal X-ray diffraction data, there is a significant amount of Y in the M1 site associated with the absence of Zr in it. Nb and Zr are concentrated in the M5 site substituting Ti. Combination of single-crystal X-ray diffraction data and electron microprobe data give the empirical formula (Ca1.04Y0.63REE0.24Mn0.02)∑1.93(Na0.92Ca0.77)∑1.69Ca2.00(Na0.65Ca0.10)∑0.75(Ti0.60Zr0.21Nb0.15Fe0.03)∑0.99((Si4.00Al0.02)∑4.02O14) (F2.61O1.39)∑4.00.

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Notes

  1. Cations sites are named after Christiansen et al. (2003).

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Acknowledgments

We thank the referees F. Camara and N. Chukanov for their helpful comments about the manuscript. The study was supported by grant from St. Petersburg State University (No 3.38.136.2014). A. Zolotarev is grateful to President Federation Grant for Young Candidates of Sciences (MK-3296.2015.5).

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Authors and Affiliations

  1. Geological Institute, Kola Science Centre, Russian Academy of Sciences, Apatity, Russia

    L. Lyalina, E. Selivanova, Ye. Savchenko, D. Zozulya & Yu. Mikhailova

  2. Department of Crystallography, Saint-Petersburg State University, St-Petersburg, Russia

    A. Zolotarev Jr & S. Krivovichev

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  1. L. Lyalina
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  2. A. Zolotarev Jr
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  3. E. Selivanova
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  4. Ye. Savchenko
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  5. D. Zozulya
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  6. S. Krivovichev
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  7. Yu. Mikhailova
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Correspondence to L. Lyalina.

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Editorial handling: L. Bindi

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Lyalina, L., Zolotarev, A., Selivanova, E. et al. Structural characterization and composition of Y-rich hainite from Sakharjok nepheline syenite pegmatite (Kola Peninsula, Russia). Miner Petrol 109, 443–451 (2015). https://doi.org/10.1007/s00710-015-0377-3

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  • DOI: https://doi.org/10.1007/s00710-015-0377-3

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