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Refinement of the crystal structures of three fluorine-bearing elbaites

  • Structure of Inorganic Compounds
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Abstract

The crystal structures of three Li-Al natural tourmalines (elbaites) containing 0.88–1.39 wt % F are refined to R= 0.0294, 0.0308, and 0.0417. It is revealed that the W threefold anion site is split into two sites, namely, the W1 threefold site and W2 ninefold site (W1–W2 ∼ 0.4 Å, Y-W 1 ≥ 1.94 Å, Y-W2 ≥ 1.75 Å). The following hypothesis is proposed and justified: the W1 and W2 sites are partially occupied by OH groups and fluorine anions, respectively. The ratio of the [YO4(OH)2] octahedra to the [YO4(OH)F] octahedra depends on the fluorine content and varies from structure to structure. The fact that the W site is more than 50% occupied by fluorine in the structures of two tourmalines under investigation allows the conclusion that fluor-elbaite with the ideal formula Na(Li1.5A11.5)A16(Si6O18)(BO3)3(OH)3F is a new mineral species and that elbaite can be considered a superspecies.

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Authors and Affiliations

  1. St. Petersburg State University, Universitetskaya nab. 7/9, St. Petersburg, 199034, Russia

    I. V. Rozhdestvenskaya, O. V. Frank-Kamenetskaya, A. A. Zolotarev, Yu. M. Bronzova & I. I. Bannova

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  1. I. V. Rozhdestvenskaya
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  2. O. V. Frank-Kamenetskaya
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  3. A. A. Zolotarev
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  4. Yu. M. Bronzova
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  5. I. I. Bannova
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__________

Translated from Kristallografiya, Vol. 50, No. 6, 2005, pp. 981–988.

Original Russian Text Copyright © 2005 by Rozhdestvenskaya, Frank-Kamenetskaya, Zolotarev, Bronzova, Bannova.

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Rozhdestvenskaya, I.V., Frank-Kamenetskaya, O.V., Zolotarev, A.A. et al. Refinement of the crystal structures of three fluorine-bearing elbaites. Crystallogr. Rep. 50, 907–913 (2005). https://doi.org/10.1134/1.2132394

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  • DOI: https://doi.org/10.1134/1.2132394

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