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Crystal structure of magnesio-ferri-hornblendite □Ca2(Mg4Fe3+)[(Si7Al)O22](OH)2 as a potentially new mineral of the amphibole supergroup

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Abstract

A sample of magnesio-ferri-hornblendite, a potential new mineral of the amphibole supergroup, was studied by X-ray diffraction and IR spectroscopy. The crystal chemical formula is (Z = 2): AK0.04 M(4) (Ca1.92Na0.08) C[M(1)(Mg1.78Fe 4+0.22 ) M(2)(Mg1.62Fe 3+0.26 Al0.12) M(3)(Mg0.64Fe 2+0.32 Mn0.04)] [T(Si7.44Al0.56)O22] W(OH)2. The monoclinic unit cell parameters are a = 9.855(1) Å, b = 18.084(1) Å, c = 5.289(1) Å, β = 104.853(2)°; V = 911.1(2) Å3; space group C2/m; Z = 2. The crystal structure was refined to R = 2.82% in the anisotropic approximation for atomic displacement parameters using 1166 reflections with I > 2σ(I). The magnesio-ferri-hornblendite structure is generally similar to the structures of other monoclinic calcium amphiboles, and its key distinctive features are the predominance of Мg among C 2+ cations and Fe3+ among C 3+ cations.

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Authors and Affiliations

  1. Shubnikov Institute of Crystallography, Russian Academy of Sciences, Leninskii pr. 59, Moscow, 119991, Russia

    E. S. Zarubina, S. M. Aksenov & R. K. Rastsvetaeva

  2. Vernadsky Institute of Geochemistry and Analytical Chemistry, Russian Academy of Sciences, ul. Kosygina 19, Moscow, 119991, Russia

    S. M. Aksenov

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

    N. V. Chukanov

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  1. E. S. Zarubina
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  2. S. M. Aksenov
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  3. N. V. Chukanov
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  4. R. K. Rastsvetaeva
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Correspondence to E. S. Zarubina.

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Original Russian Text © E.S. Zarubina, S.M. Aksenov, N.V. Chukanov, R.K. Rastsvetaeva, 2016, published in Doklady Akademii Nauk, 2016, Vol. 470, No. 1, pp. 43–49.

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Zarubina, E.S., Aksenov, S.M., Chukanov, N.V. et al. Crystal structure of magnesio-ferri-hornblendite □Ca2(Mg4Fe3+)[(Si7Al)O22](OH)2 as a potentially new mineral of the amphibole supergroup. Dokl Chem 470, 245–251 (2016). https://doi.org/10.1134/S0012500816090032

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