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Crystal Structure of Niobium-Rich Lomonosovite with Symmetry P1 from the Khibiny Massif (Kola Peninsula)

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Abstract

A new niobium-rich lomonosovite variety with a high degree of ordering of Ti and Nb atoms has been investigated by X-ray diffraction analysis and electron probe microanalysis. Its simplified formula is Na10Ti2(Nb,Fe,Ti)2(Si2O7)2(PO4)2O4. The triclinic unit-cell parameters are a = 5.411(1) Å, b = 7.108(1) Å, c = 14.477(2) Å, α = 99.78(1)°, β = 96.59(1)°, γ = 90.26(1)°, V = 544.94(5) Å3, Z = 1, sp. gr. P1. The crystal structure has been refined to the final reliability factor R = 6.3% within the anisotropic approximation of atomic displacements using 3674 reflections with F > 3σ(F). The problem of niobium distribution in minerals with structures of lomonosovite and related types is discussed.

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ACKNOWLEDGMENTS

We are grateful to V.G. Senin for performing the microprobe analysis. This study was performed at the Shared Equipment Center of the Federal Scientific Research Centre “Crystallography and Photonics,” Russian Academy of Sciences.

Funding

This study was supported by the Ministry of Science and Higher Education of the Russian Federation (project no. RFMEFI62119X0035) within a State assignment for the Federal Scientific Research Centre “Crystallography and Photonics” (Russian Academy of Sciences) in the part concerning the X-ray diffraction analysis and within a State assignment for the Vernadsky Institute of Geochemistry and Analytical Chemistry of the Russian Academy of Sciences in the part concerning the chemical investigation of the material and by the Russian Foundation for Basic Research, project no. 18-29-12005, in the part concerning the crystallochemical analysis of lomonosovite-group layered minerals.

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Authors and Affiliations

  1. Shubnikov Institute of Crystallography, Federal Scientific Research Centre “Crystallography and Photonics,” Russian Academy of Sciences, 119333, Moscow, Russia

    R. K. Rastsvetaeva

  2. Vernadsky Institute of Geochemistry and Analytical Chemistry, Russian Academy of Sciences, 119334, Moscow, Russia

    V. A. Zaitsev & I. V. Pekov

  3. Moscow State University, Moscow, Russia

    I. V. Pekov

Authors
  1. R. K. Rastsvetaeva
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  2. V. A. Zaitsev
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  3. I. V. Pekov
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Correspondence to R. K. Rastsvetaeva.

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Translated by Yu. Sin’kov

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Rastsvetaeva, R.K., Zaitsev, V.A. & Pekov, I.V. Crystal Structure of Niobium-Rich Lomonosovite with Symmetry P1 from the Khibiny Massif (Kola Peninsula). Crystallogr. Rep. 65, 422–427 (2020). https://doi.org/10.1134/S1063774520030268

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  • DOI: https://doi.org/10.1134/S1063774520030268

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