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Crystal chemistry of a Ba-dominant analogue of hydrodelhayelite and natural ion-exchange transformations in double- and triple-layer phyllosilicates in post-volcanic systems of the Eifel region, Germany

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Abstract

A Ba-dominant (Ba > K) analogue of hydrodelhayelite (BDAH) from Löhley (Eifel Mts., Rhineland-Palatinate, Germany) and Ba-enriched varieties of related double- and triple-layer phyllosilicates from Eifel are studied. The crystal structure of BDAH was solved by direct methods and refined to R = 0.0698 [1483 unique reflections with I > 2σ(I)]. It is orthorhombic, Pmmn, a = 23.9532(9), b = 7.0522(3), c = 6.6064(3) Å, V = 1115.97(8) Å3, Z = 2. The structure is based upon delhayelite-type double-layer tetrahedral blocks [(Al,Si)4Si12O34(OH,O)4] connected by chains of (Ca,Fe)-centered octahedra. Ba2+ and subordinate K+ occur at partially vacant sites in zeolitic channels within the tetrahedral blocks. The crystal-chemical formula of BDAH is: (Ba0.42K0.34□0.24)(Ca0.88Fe0.12)2(□0.90Mg0.10)2[Si6(Al0.5Si0.5)2O17(OH0.71O0.29)2]⋅6H2O. The formation of BDAH and Ba-rich varieties of altered delhayelite/fivegite, günterblassite and hillesheimite is considered as a result of leaching of Na, Cl, F and, partially, K and Ca accompanied with hydration and the capture of Ba as a result of natural ion exchange. These minerals are structurally a “bridge” between single-layer phyllosilicates and zeolites having the open three-dimensional tetrahedral Al-Si-O frameworks.

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Acknowledgments

We thank two anonymous referees for valuable comments. This study was supported by the Russian Science Foundation, grant no. 14-17-00048.

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Authors and Affiliations

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

    N. V. Zubkova, I. V. Pekov, A. G. Turchkova, I. S. Lykova & D. Yu. Pushcharovsky

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

    N. V. Chukanov

  3. Im Straussenpesch 22, 53518, Adenau, Germany

    W. Schüller

  4. Bahnhofstrasse 45, 56727, Mayen, Germany

    B. Ternes

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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. A. G. Turchkova
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  5. I. S. Lykova
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  6. W. Schüller
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  8. D. Yu. Pushcharovsky
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Correspondence to N. V. Zubkova.

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Editorial handling: L. Bindi

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Zubkova, N.V., Chukanov, N.V., Pekov, I.V. et al. Crystal chemistry of a Ba-dominant analogue of hydrodelhayelite and natural ion-exchange transformations in double- and triple-layer phyllosilicates in post-volcanic systems of the Eifel region, Germany. Miner Petrol 110, 885–893 (2016). https://doi.org/10.1007/s00710-016-0441-7

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