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Crystal structure of magnesioferrikatophorite

  • Structure of Inorganic Compounds
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Abstract

The crystal structure of the Na,Ca-amphibole magnesioferrikatophorite found in carbonatites from the Turiy Cape (Kola Peninsula) was refined (Siemens P4 diffractometer, λMoK α radiation, 1481 independent reflections with |F|>4σ(F), anisotropic refinement, R(F) = 0.039). The parameters of the monoclinic unit cell are a = 9.875(5) Å, b = 18.010(8) Å, c = 5.309(3) Å, β = 104.39(5)°, sp. gr. C2/m, Z = 2. The distribution of the cations over the crystallographically nonequivalent M(1–4)-positions was revealed by Mössbauer spectroscopy and X-ray diffraction analysis. The character of splitting of the A-position correlates with the characteristic features of the magnesioferrikatophorite composition. The resulting structural formula (Na0.87K0.13)Σ = 1 · (Na1.18Ca0.82)Σ = 2(Mg1.41Fe 3+0.42 Ti 4+0.17 )Σ= 2 Fe 3+1.31 Mg0.69)Σ = 2(Mg0.60Fe 2+0.38 Mn0.02)Σ = 1(Si3.16Al0.84)Σ = 4 · Si4O22(O1.05OH0.66F0.29)Σ= 2 agrees well with the electron microprobe analysis data. Based on the zonal character of the crystal and high Fe 3+ content, the conditions of crystallogenesis are defined as oxidative against the background of a decrease in the Na potential in the course of the evolution of a mineral-forming system.

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Authors and Affiliations

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

    D. Yu. Pushcharovskii, Yu. S. Lebedeva, I. V. Pekov & A. A. Novakova

  2. Department of Mineralogy and Petrology, University of Turin, Via Valperga Caluso 35, Turin, 10125, Italy

    G. Ferraris & G. Ivaldi

Authors
  1. D. Yu. Pushcharovskii
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  2. Yu. S. Lebedeva
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  3. I. V. Pekov
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  4. G. Ferraris
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  5. A. A. Novakova
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  6. G. Ivaldi
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__________

Translated from Kristallografiya, Vol. 48, No. 1, 2003, pp. 21–28.

Original Russian Text Copyright © 2003 by Pushcharovskii, Lebedeva, Pekov, Ferraris, Novakova, Ivaldi.

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Pushcharovskii, D.Y., Lebedeva, Y.S., Pekov, I.V. et al. Crystal structure of magnesioferrikatophorite. Crystallogr. Rep. 48, 16–23 (2003). https://doi.org/10.1134/1.1541736

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  • DOI: https://doi.org/10.1134/1.1541736

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