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Avdoninite: New data, crystal structure and refined formula K2Cu5Cl8(OH)4 · 2H2O

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Abstract

The paper reports new findings of avdoninite from deposits of active fumaroles in the Second Scoria Cone at the Northern Breach of the Great Fissure Tolbachik Eruption, Tolbachik Volcano, Kamchatka Peninsula, Russia. The crystal structure of the mineral has been determined for the first time, which has allowed reliable determination of its space group and unit cell dimensions, refinement of its formula K2Cu5-Cl8(OH)4 · 2H2O, and correct indexing of its X-ray powder diffraction pattern. Avdoninite is monoclinic, space group P21/c, a = 11.592(2), b = 6.5509(11), c = 11.745(2) Å, β = 91.104(6)°, V = 891.8(3) Å3, Z = 2. The crystal structure of this mineral has been determined on a single crystal R 1 [F > 4σ (F)] = 0.063. It is based on sheets of copper–oxo-chloride complexes [Cu5Cl8(OH)4]2– parallel to (100). The K+ cation and H2O molecules are interlayers.

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Authors and Affiliations

  1. Faculty of Geology, Moscow State University, Moscow, 119991, Russia

    I. V. Pekov & V. O. Yapaskurt

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

    S. V. Krivovichev

  3. Institute of Problems of Chemical Physics, Russian Academy of Sciences, Chernogolovka, Moscow oblast, 142432, Russia

    N. V. Chukanov

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

    E. G. Sidorov

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  1. I. V. Pekov
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  2. S. V. Krivovichev
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  3. N. V. Chukanov
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  4. V. O. Yapaskurt
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  5. E. G. Sidorov
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Correspondence to I. V. Pekov.

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Original Russian Text © I.V. Pekov, S.V. Krivovichev, N.V. Chukanov, V.O. Yapaskurt, E.G. Sidorov, 2015, published in Zapiski Rossiiskogo Mineralogicheskogo Obshchestva, 2015, No. 3, pp. 55–69.

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Pekov, I.V., Krivovichev, S.V., Chukanov, N.V. et al. Avdoninite: New data, crystal structure and refined formula K2Cu5Cl8(OH)4 · 2H2O. Geol. Ore Deposits 58, 568–578 (2016). https://doi.org/10.1134/S1075701516070084

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  • DOI: https://doi.org/10.1134/S1075701516070084

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