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Crystal structure of tveitite-(Y): Fractionation of rare-earth elements between positions and the variety of defects

  • Structure of Inorganic Compounds
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Abstract

The crystal structure of the mineral tveitite-(Y) (Y0.883Na0.106) (Ca0.841 LREE 0.159)(Ca0.716Na0.204 HREE 0.080)(Ca0.092Na0.074)F6.952 from amazonite pegmatites of Rov-Gora Mountain (Keivy, Kola Peninsula) is determined using X-ray diffraction (Stoe IPDS diffractometer, λMoK α, graphite monochromator, 2θmax = 63.5°, R = 0.051 for 1542 reflections). The main crystal data are as follows: a = 17.020(2) Å, c = 9.679(2) Å, V = 2428.2(4) Å3, space group \(R\bar 3\), Z = 18, and ρcalcd = 4.00 g/cm3. The idealized structural formula of the mineral is represented as (Y,Na)6(Ca,LREE)6(Ca,Na,HREE)6(Ca,Na)F42 (Z = 3). The defect structure of the mineral manifests itself in a mixed occupation of all four independent cation positions and in a randomly disordered distribution of fluorine atoms over the majority of anion positions. It is shown that the crystal structure of tveitite-(Y) fulfills the function of an “Eratosthenes sieve” for yttrium cations and two groups of lanthanide cations, so that these cations are distributed over three different positions.

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Authors and Affiliations

  1. Moscow State University, Leninskie gory, Moscow, 119992, Russia

    O. V. Yakubovich & I. V. Pekov

  2. Philipps-Universität Marburg, Biegenstrasse 10, Marburg, D-35032, Germany

    W. Massa & P. G. Gavrilenko

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  1. O. V. Yakubovich
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  2. W. Massa
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  3. I. V. Pekov
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  4. P. G. Gavrilenko
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Dedicated to the 50th Anniversary of the Journal

Original Russian Text © O.V. Yakubovich, W. Massa, I.V. Pekov, P.G. Gavrilenko, 2007, published in Kristallografiya, 2007, Vol. 52, No. 1, pp. 73–81.

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Yakubovich, O.V., Massa, W., Pekov, I.V. et al. Crystal structure of tveitite-(Y): Fractionation of rare-earth elements between positions and the variety of defects. Crystallogr. Rep. 52, 71–79 (2007). https://doi.org/10.1134/S1063774507010087

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  • DOI: https://doi.org/10.1134/S1063774507010087

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