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New Data on the Isomorphism in Eudialyte-Group Minerals. VIII: Crystal Structure of the Fe2+-Analog of Feklichevite, a Potentially New Mineral from the Khibiny Massif

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Abstract

A potentially new calcium-rich eudialyte-group mineral from the Khibiny massif has been investigated by X-ray diffraction (XRD) analysis. The trigonal unit-cell parameters are found to be as follows: a = 14.221(1) Å, c = 30.04(1) Å, and V = 5261.3 Å3; sp. gr. R3m. The crystal structure is refined to the final reliability factor R = 2.8% in the anisotropic approximation of atomic displacements, using 1714 reflections with F > 3σ(F). The idealized formula of the mineral (Z = 3) is (Na12Ca3)Ca6Fe\(_{3}^{{2 + }}\)Zr3NbSi25O75(H2O,OH,F,Cl)3. The dominance of divalent iron form is confirmed by Mössbauer spectroscopy data. The closest analog of the mineral under study is feklichevite from the Kovdor alkaline massif; the main difference is the dominance of divalent iron over trivalent iron in the former.

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ACKNOWLEDGMENTS

In this study, we used the collections of A.P. Khomyakov, who had been working for a long time on agpaitic pegmatites of the Kola peninsula; these collections still retain scientific importance.

We are grateful to V.S. Rusakov for supplying preliminary Mössbauer spectroscopy data.

Funding

This study was supported by the Ministry of Science and Higher Education of the Russian Federation within a State assignment for the Federal Scientific Research Centre “Crystallography and Photonics” of the Russian Academy of Sciences in the part concerning the XRD analysis; by a State contract (State account no. ААА-А19-119092390076-7) in the part concerning the IR spectroscopy; and by the Russian Foundation for Basic Research, project nos. 18-29-12005 and 18-29-12007-mk, in the part concerning the crystallochemical analysis of microporous eudialyte-group 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. Institute of Problems of Chemical Physics, Russian Academy of Sciences, 142432, Chernogolovka, Moscow oblast, Russia

    N. V. Chukanov

  3. Korzhinskii Institute of Experimental Mineralogy, Russian Academy of Sciences, 142432, Chernogolovka, Moscow oblast, Russia

    L. V. Sipavina & M. V. Voronin

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  1. R. K. Rastsvetaeva
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  2. N. V. Chukanov
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  3. L. V. Sipavina
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  4. M. V. Voronin
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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., Chukanov, N.V., Sipavina, L.V. et al. New Data on the Isomorphism in Eudialyte-Group Minerals. VIII: Crystal Structure of the Fe2+-Analog of Feklichevite, a Potentially New Mineral from the Khibiny Massif. Crystallogr. Rep. 65, 704–710 (2020). https://doi.org/10.1134/S1063774520050181

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  • DOI: https://doi.org/10.1134/S1063774520050181

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