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Refined crystal structure of parakeldyshite and the genetic crystal chemistry of zirconium minerals with [Si2O7] diorthogroups

  • Structure of Inorganic Compounds
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Abstract

The structure of the mineral parakeldyshite Na1.93ZrSi2O6.93(OH)0.07 is refined by X-ray diffraction analysis. The main crystallographic data are as follows: space group P \(\overline 1 \), a = 6.617(2) Å, b = 8.813(1) Å, c = 5.426(1) Å, α = 87.26(3)°, β = 85.68(3)°, γ = 71.45(3)°, and R F = 0.0153. The initial structural model of this mineral is confirmed. Within this model, the structure of parakeldyshite is based on the heteropolyhedral framework formed by [Si2O7] diorthogroups, which are linked together through isolated zirconium octahedra. The fundamental difference between the structure under investigation and the initial structural model is associated with the arrangement of the extraframework cations. A comparative crystal chemical analysis of the zirconium silicates with [Si2O7] diorthogroups is performed.

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Authors and Affiliations

  1. Faculty of Geology, Lomonosov Moscow State University, Leninskie gory, Moscow, 119992, Russia

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

  2. Institüt für Mineralogie und Kristallographie, Universität Wien, Wien, A-1090, Austria

    U. Kolitsch & E. Tillmanns

Authors
  1. I. V. Pekov
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  2. N. V. Zubkova
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  3. D. Yu. Pushcharovsky
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  4. U. Kolitsch
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  5. E. Tillmanns
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Correspondence to N. V. Zubkova.

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Original Russian Text © I.V. Pekov, N.V. Zubkova, D.Yu. Pushcharovsky, U. Kolitsch, E. Tillmanns, 2007, published in Kristallografiya, 2007, Vol. 52, No. 6, pp. 1100–1105

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Pekov, I.V., Zubkova, N.V., Pushcharovsky, D.Y. et al. Refined crystal structure of parakeldyshite and the genetic crystal chemistry of zirconium minerals with [Si2O7] diorthogroups. Crystallogr. Rep. 52, 1066–1071 (2007). https://doi.org/10.1134/S1063774507060223

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  • DOI: https://doi.org/10.1134/S1063774507060223

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