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Pyroxenoids of pyroxmangite–pyroxferroite series from xenoliths of Bellerberg paleovolcano (Eifel, Germany): Chemical variations and specific features of cation distribution

  • Structure of Inorganic Compounds
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Abstract

The pyroxferroite and pyroxmangite from xenoliths of aluminous gneisses in the alkaline basalts of Bellerberg paleovulcano (Eifel, Germany) have been studied by electron-probe and X-ray diffraction methods and IR spectroscopy. The parameters of the triclinic unit cells are found to be a = 6.662(1) Å, b = 7.525(1) Å, c = 15.895(2) Å, α = 91.548(3)°, β = 96.258(3)°, and γ = 94.498(3)° for pyroxferroite and a = 6.661(3) Å, b = 7.513(3) Å, c = 15.877(7) Å, α = 91.870(7)°, β = 96.369(7)°, and γ = 94.724(7)° for pyroxmangite; sp. gr. \(P\overline 1 \). The crystallochemical formulas (Z = 2) are, respectively, M(1–2)(Mn0.5Ca0.4Na0.1)2 M(3–6)(Fe, Mn)4 M7[Mg0.6(Fe, Mn)0.4][Si7O21] and M(1–3)(Mn, Fe)3 M(4–6)[(Fe, Mn)0.7Mg0.3]3 M7[Mg0.5(Fe, Mn)0.5][Si7O21]. For these and previously studied representatives of the pyroxmangite structural type, an analysis of the cation distribution over sites indicates wide isomorphism of Mn2+, Fe2+, and Mg in all cation M(1–7) sites and the preferred incorporation of Сa and Na into large seven-vertex M1O7 and M2O7 polyhedra and Mg into the smallest five-vertex M7O5 polyhedron.

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Authors and Affiliations

  1. Moscow State University, Moscow, Russia

    N. V. Shchipalkina, I. V. Pekov & R. K. Rastsvetaeva

  2. Shubnikov Institute of Crystallography, Federal Scientific Research Centre “Crystallography and Photonics,”, Russian Academy of Sciences, Moscow, 119333, Russia

    N. V. Shchipalkina & S. M. Aksenov

  3. Nesmeyanov Institute of Organoelement Compounds, Russian Academy of Sciences, Moscow, Russia

    S. M. Aksenov

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

    N. V. Chukanov

  5. Südwestdeutsche Salzwerke AG, 74076, Heilbronn, Germany

    C. Schäfer

  6. Bahnhofstrasse 45, 56727, Mayen, Germany

    B. Ternes

  7. Im Straussenpesch 22, 53518, Adenau, Germany

    W. Shüller

Authors
  1. N. V. Shchipalkina
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  2. S. M. Aksenov
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  3. N. V. Chukanov
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  4. I. V. Pekov
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  5. R. K. Rastsvetaeva
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  6. C. Schäfer
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  7. B. Ternes
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  8. W. Shüller
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Correspondence to N. V. Shchipalkina.

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Original Russian Text © N.V. Shchipalkina, S.M. Aksenov, N.V. Chukanov, I.V. Pekov, R.K. Rastsvetaeva, C. Schäfer, B. Ternes, W. Shüller, 2016, published in Kristallografiya, 2016, Vol. 61, No. 6, pp. 896–904.

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Shchipalkina, N.V., Aksenov, S.M., Chukanov, N.V. et al. Pyroxenoids of pyroxmangite–pyroxferroite series from xenoliths of Bellerberg paleovolcano (Eifel, Germany): Chemical variations and specific features of cation distribution. Crystallogr. Rep. 61, 931–939 (2016). https://doi.org/10.1134/S1063774516060146

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  • DOI: https://doi.org/10.1134/S1063774516060146

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