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The Discovery of the Mineral Knasibfite K3Na4(SiF6)3(BF4) on Tolbachik Volcano, Kamchatka and Details of its Crystal Structure

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Abstract

This paper presents the results of mineralogical and crystallographic studies in the first Russian finding of a mineral belonging to the fluoride class, viz., knasibfite, which was found in fumarolic deposits discharged during the Great Tolbachik Fissure Eruption. We investigated its crystal structure to corroborate the fact that knasibfite is orthorhombic, sp. gr. Imm2; a = 17.181 (2), b = 5.537 (4), c = 9.205 (7) Å, V = 875 (1) Å3. The structural features that can be seen in this mineral classify it as belonging to a special group of compounds that has inherited its structure from a high temperature modification or from the medium where it crystallized.

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ACKNOWLEDGMENTS

We thank Senior Researcher V.M. Chubarov (IV&S FEB RAS) for valuable comments on our electron microscope study.

Funding

This work was supported by the Russian Foundation for Basic Research, project no. 18-29-12106. The monocrystal X-ray diffraction studies were performed using equipment available at the X-Ray Diffraction Analysis Resource Center at the St. Petersburg University, the X-ray phase and chemical analyses were carried out at the Analytical Center of the IV&S FEB RAS.

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Authors and Affiliations

  1. Institute of Silicate Chemistry, Russian Academy of Sciences, nab. Makarova, 2, 199034, St. Petersburg, Russia

    A. P. Shablinskii & R. S. Bubnova

  2. Institute of Volcanology and Seismology, Far East Branch, Russian Academy of Sciences, bulvar Piipa, 9, 683006, Petropavlovsk-Kamchatsky, Russia

    L. P. Vergasova, S. V. Moskaleva & M. A. Nazarova

  3. Chair of Crystallography, St. Petersburg State University, Universitetskaya nab., 7/9, 199034, St. Petersburg, Russia

    A. P. Shablinskii, S. K. Filatov & R. S. Bubnova

Authors
  1. A. P. Shablinskii
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  2. L. P. Vergasova
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  3. S. K. Filatov
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  4. S. V. Moskaleva
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  5. M. A. Nazarova
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  6. R. S. Bubnova
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Correspondence to A. P. Shablinskii.

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Translated by A. Petrosyan

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Shablinskii, A.P., Vergasova, L.P., Filatov, S.K. et al. The Discovery of the Mineral Knasibfite K3Na4(SiF6)3(BF4) on Tolbachik Volcano, Kamchatka and Details of its Crystal Structure. J. Volcanolog. Seismol. 14, 177–186 (2020). https://doi.org/10.1134/S0742046320030069

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