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Ta-Free Nb-Dominant Ixiolite Analogue from the Eifel Paleovolcanic Region, Germany, and Its Crystal Structure. On the Problem of “Ashanite”

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Abstract

The crystal structure of a Ta-free Nb-dominant ixiolite analogue with the empirical formula (Nb1.55Ti1.11\({\text{Fe}}_{{1.01}}^{{3 + }}{\text{Mn}}_{{0.19}}^{{2 + }}{\text{Cr}}_{{0.04}}^{{3 + }}\)Mg0.04Al0.03Zr0.02\({\text{Mn}}_{{0.01}}^{{3 + }}\))Σ4O8 (Z = 1) from the Laach Lake area (Eifel, Germany) has been studied on the basis of single-crystal X-ray diffraction data and refined in the space group Pbcn to R = 4.47%. The unit-cell parameters are a = 4.6578(6), b = 5.6230(7), c = 5.0182(5) Å, and V = 131.43(3) Å3. The mineral belongs to the α-PbO2 structure type. It was found in volcanic nosean sanidinite, in a late (presumably, pneumatolytic) mineral assemblage containing sanidine, nosean, magnetite, ilmenite, biotite, corundum, and columbite-(Fe). The crystal chemistry of the ixiolite-like niobate has been discussed, including an aspect related to the definition of the discredited mineral species “ashanite.”

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Funding

This work was supported by the Russian Science Foundation (grant no. 19-17-00050; structural research, crystallochemical and mineralogenetic analysis). The chemical composition of the mineral was studied in the framework of a state assignment, state registration no. АALA-А19-119092390076-7.

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Authors and Affiliations

  1. Moscow State University, 119991, Moscow, Russia

    N. V. Zubkova, N. V. Chukanov, I. V. Pekov & D. Yu. Pushcharovskii

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

    N. V. Chukanov

  3. Vernadsky Institute of Geochemistry and Analytical Chemistry, Russian Academy of Sciences, 119991, Moscow, Russia

    I. V. Pekov

  4. Bahnhofstrasse 45, 56727, Mayen, Germany

    B. Ternes

  5. Im Straussenpesch 22, 53518, Adenau, Germany

    W. Schüller

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  1. N. V. Zubkova
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  2. N. V. Chukanov
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  3. I. V. Pekov
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  4. B. Ternes
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  5. W. Schüller
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  6. D. Yu. Pushcharovskii
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Correspondence to N. V. Zubkova.

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Translated by E. Maslennikova

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Zubkova, N.V., Chukanov, N.V., Pekov, I.V. et al. Ta-Free Nb-Dominant Ixiolite Analogue from the Eifel Paleovolcanic Region, Germany, and Its Crystal Structure. On the Problem of “Ashanite”. Geol. Ore Deposits 63, 805–811 (2021). https://doi.org/10.1134/S1075701521080110

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