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Crystal chemistry of dorrite from the Eifel volcanic region, Germany, and chemical variations in the khesinite-dorrite-rhönite-kuratite solid-solution system

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Abstract

Dorrite, khesinite and rhönite from metamorphosed calcic xenoliths of the Bellerberg paleovolcano (Eifel, Germany) were studied, including first determination of the crystal structure of natural dorrite (R = 0.0636). Dorrite is triclinic, P-1, unit-cell parameters are: a = 10.4316(7), b = 10.8236(9), c = 8.9488(7) Å, α = 105.972(6), β = 96.003(9), γ = 124.67(10)° and V = 754.10(11) Å3. Its crystal-chemical formula is (Z = 1): M8Ca2M9Ca2M1Fe3 + M2Fe3 + M3(Fe3+0.8Mg0.2)2M4(Fe3+0.8Mg0.2)2M5(Mg0.9Fe3+0.1)2M6(Mg0.5Fe3+0.5)2M7(Fe3+0.9Al0.1)2[T1(Al0.75Si0.20Fe3+0.05)2T2(Al0.77Si0.20Fe3+0.03)2T3(Al0.9Fe3+0.1)2T4Si2T5(Fe3+0.6Al0.4)2T6(Fe3+0.6Al0.4)2]O40. New and earlier published data show that khesinite, dorrite, rhönite and kuratite form a solid-solution system without significant gaps. The chemical variation and isomorphous substitutions in this system are discussed and the following simplified formulae are suggested: dorrite, Ca2(Fe3+,Mg)5Mg[(Al,Fe3+,Si)5SiO20], khesinite, Ca2(Fe3+,Mg)5Mg[(Fe3+,Al,Si)5SiO20], and rhönite, Ca2(Mg,Fe3+)5Ti[(Si,Al)6O20].

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Acknowledgements

We are grateful to Sergey M. Aksenov for collecting of single-crystal XRD data and to anonymous reviewers for valuable comments. This study was supported by the Russian Science Foundation, grant no. 14-17-00048 (in part of electron probe studies of minerals), and the Russian Foundation for Basic Research, grant no. 18-05-00332 (in part of crystal structure studies).

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Authors and Affiliations

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

    Nadezhda V. Shchipalkina, Igor V. Pekov & Natalya N. Koshlyakova

  2. Shubnikov Institute of Crystallography and Photonics, RAS, Moscow, Russia

    Nadezhda V. Shchipalkina

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

    Nikita V. Chukanov

  4. Mayen, Germany

    Bernd Ternes

  5. Adenau, Germany

    Willi Schüller

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  1. Nadezhda V. Shchipalkina
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  2. Igor V. Pekov
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  3. Nikita V. Chukanov
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  4. Natalya N. Koshlyakova
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  5. Bernd Ternes
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Correspondence to Nadezhda V. Shchipalkina.

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Shchipalkina, N.V., Pekov, I.V., Chukanov, N.V. et al. Crystal chemistry of dorrite from the Eifel volcanic region, Germany, and chemical variations in the khesinite-dorrite-rhönite-kuratite solid-solution system. Miner Petrol 113, 249–259 (2019). https://doi.org/10.1007/s00710-018-0645-0

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