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New Data on the Isomorphism in Eudialyte-Group Minerals. VII: Crystal Structure of the Eudialyte–Sergevanite Series Mineral from the Lovozero Alkaline Massif

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Abstract

An intermediate member of the eudialyte–sergevanite solid-solution series has been investigated by X-ray diffraction analysis, electron probe microanalysis, and IR spectroscopy. The trigonal unit-cell parameters of the mineral are found to be a = 14.1944(4) Å, c = 30.294(1) Å, and V = 5286.0(3) Å3; sp. gr. R3. The crystal structure is refined to the final reliability factor R = 4.48% in the anisotropic approximation of atomic displacements, using 2420 reflections with F > 3σ(F). The idealized formula of the mineral (Z = 3) is Na14Sr(Ca3Mn3)(Na2Fe)Zr3Si26O72(OH)3Cl · H2O. An increase in the Ca and Fe contents in comparison with the holotype sergevanite does not increase symmetry. The problems of genesis of calcium-poor minerals with eudialyte-type structure are discussed.

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Funding

This study was supported by the Ministry of Science and Higher Education of the Russian Federation within the State assignment for the Federal Scientific Research Centre “Crystallography and Photonics” of the Russian Academy of Sciences in the part concerning the X-ray diffraction analysis and by the Russian Foundation for Basic Research in the parts concerning the crystallochemical analysis of microporous eudialyte-group minerals (project no. 18-29-12005) and the collection of the mineral, analysis of its chemical composition, and diagnostics of the associating minerals (project no. 18-29-12007_mk). The IR spectroscopy study was carried out within a State contract (State account no. ААА-А19-119092390076-7). This study was performed using equipment of the Center of Collective Use of the Federal Scientific Research Centre “Crystallography and Photonics” and supported by the Ministry of Science and Higher Education (project no. RFMEFI62119X0035).

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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. Faculty of Geology, Moscow State University, 119991, Moscow, Russia

    N. V. Chukanov

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

    K. V. Van

Authors
  1. R. K. Rastsvetaeva
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  2. N. V. Chukanov
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  3. K. V. Van
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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. & Van, K.V. New Data on the Isomorphism in Eudialyte-Group Minerals. VII: Crystal Structure of the Eudialyte–Sergevanite Series Mineral from the Lovozero Alkaline Massif. Crystallogr. Rep. 65, 554–559 (2020). https://doi.org/10.1134/S1063774520040173

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  • DOI: https://doi.org/10.1134/S1063774520040173

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