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Isomorphism in pyroxmangite-type pyroxenoids: Mg-rich pyroxmangite from sanidinite of the Eifel paleovolcanic region, Rhineland-Palatinate, Germany

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Abstract

The crystal structure of Mg-rich pyroxmangite from sanidinite of the Laach Lake (Laacher See) Volcano, Eifel paleovolcanic region, Rhineland-Palatinate, Germany has been solved based on single-crystal X-ray diffraction data, the final R indices for all data are: R1 = 0.0302, wR2 = 0.0617. Parameters of the triclinic unit cell are: a = 9.6410(4), b = 10.4328(6), c = 17.3419(9) Å, α = 112.256(5), β = 102.806(4), γ = 82.935(4)°, V = 1572.72(15) Å3. Space group is C-1. The empirical formula of the studied sample is Mn3.48Mg1.78Fe1.61Ca0.13(Si7.00O21), and the refined crystal-chemical formula is M1[(Mn,Fe)0.90Mg0.10] M2[(Mn,Fe)0.93Mg0.07] M3[(Mn,Fe)0.84Mg0.16] M4[(Mn,Fe)0.63Mg0.37] M5[(Mn,Fe)0.74Mg0.26] M1[(Mn,Fe)0.69Mg0.31] M1[(Mn,Fe)0.54Mg0.46] [Si7O21]. This sample is characterized by a stronger disordering of Mg among the M sites as compared to Mg-rich members of the pyroxmangite-pyroxferroite solid-solution series from xenoliths hosted by basalt of the Bellerberg volcano, Eifel. The genetic factors which could influence to the cation ordering in pyroxmangite-type minerals are discussed.

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Acknowledgements

We are grateful to two anonymous reviewers for their valuable comments and notes. This work was supported by the Russian Science Foundation, project no. 19-17-00050. A part of this work (IR spectroscopy and chemical analysis of pyroxmangite from the Laach Lake volcano) was carried out in accordance with the state task of Russian Federation, state registration No. AAAA-A19-1190.

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Authors and Affiliations

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

    Nadezhda V. Shchipalkina, Natalia V. Zubkova, Igor V. Pekov, Natalia N. Koshlyakova & Dmitry Yu. Pushcharovsky

  2. Institute of Problems of Chemical Physics, Russian Academy of Sciences, Chernogolovka, 142432, Russia

    Nikita V. Chukanov

  3. Gustav Stresemann-Strasse 34, 74257, Untereisesheim, Germany

    Christof Schäfer

  4. Institute of Experimental Mineralogy, Russian Academy of Sciences, Akademika Osypyana Ul., 4, Chernogolovka, 142432, Russia

    Konstantin V. Van

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  1. Nadezhda V. Shchipalkina
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Correspondence to Nadezhda V. Shchipalkina.

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Shchipalkina, N.V., Chukanov, N.V., Zubkova, N.V. et al. Isomorphism in pyroxmangite-type pyroxenoids: Mg-rich pyroxmangite from sanidinite of the Eifel paleovolcanic region, Rhineland-Palatinate, Germany. Miner Petrol 115, 631–641 (2021). https://doi.org/10.1007/s00710-021-00763-x

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