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Crystal structure of yegorovite Na4[Si4O8(OH)4] · 7H2O

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Abstract

Using X-ray analysis, the crystal structure of yegorovite Na4[Si4O8(OH)4] · 7H2O, a newly-discovered mineral from the Lovozero alkaline complex (Kola Peninsula, Russia), was determined. The mineral is monoclinic, of P21/c, a = 9.8744(4), b = 12.3981(5), c = 14.8973(7) Å, β = 104.675(5)°, V =1764.29(13)Å3, Z = 4. Yegorovite is a representative of a new structure type. Its structure is based upon the zigzag chains [Si4O8(OH)4]∞ extended along [100]. The Na atoms occupy four nonequivalent crystallographic positions and are located in six-fold polyhedra [NaO(OH)2(H2O)3] and [NaO(OH)(H2O)4]. The Na polyhedra are joined with each other by vertices and edges to form corrugated layers parallel to (001). To each of these layers, the silicon-oxygen chains adjoin from both sides, and the neighboring Na-Si layers are combined with one another by a system of H-bonds.

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Authors and Affiliations

  1. Moscow State University, Moscow, Russia

    N. V. Zubkova, I. V. Pekov & D. Yu. Pushcharovskii

  2. Shubnikov Institute of Crystallography, Russian Academy of Sciences, Moscow, Russia

    S. S. Kazantsev

Authors
  1. N. V. Zubkova
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  2. I. V. Pekov
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  3. D. Yu. Pushcharovskii
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  4. S. S. Kazantsev
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Original Russian Text © N.V. Zubkova, I.V. Pekov, D.Yu. Pushcharovskii, S.S. Kazantsev, 2009, published in Doklady Akademii Nauk, 2009, Vol. 426, No. 6, pp. 797–801.

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Zubkova, N.V., Pekov, I.V., Pushcharovskii, D.Y. et al. Crystal structure of yegorovite Na4[Si4O8(OH)4] · 7H2O. Dokl. Earth Sc. 427, 814–818 (2009). https://doi.org/10.1134/S1028334X09050237

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  • DOI: https://doi.org/10.1134/S1028334X09050237

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