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Natural specimen of triple solid solution ettringite–thaumasite–chromate-ettringite

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Abstract

Three natural minerals of ettringite group were investigated by TG to refine their chemical composition. Two samples are ettringite Ca5.97Mg0.01Sr0.02Al1.99Cr0.01(SO4)3(OH)12·23.7H2O and bentorite Ca5.99Mg0.01Cr1.95Al0.01Si0.03(SO4)2.82·(CO3)0.20(OH)12·19.4H2O, but the third one Ca5.99Na0.01Al1.38Si0.62(SO4)2.49·(CrO4)0.36·(CO3)0.46(OH)12·15.8H2O has found to be a solid solution among ettringite, thaumasite, and chromate-ettringite, not registered yet as a new mineral species. Similar phase is well known in concrete formed with Cr6+ admixture, but is found for the first time as a natural compound. X-ray single-crystal investigation allowed us to refine the structure and support substitution (SO4)2− ↔ (CrO4)2− in natural minerals of ettringite group.

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Acknowledgements

We wish to thank Dr. V.V. Sharygin for cooperation and helpful advice (Sobolev Institute of Geology and Mineralogy (IGM), Novosibirsk), Drs. M.N. Murashko (Systematic Mineralogy Company, St. Petersburg), V.V. Sharygin, and Ye. Vapnik (Ben-Gurion University of the Negev, Beer-Sheva) donating samples of ettringite- and bentorite-bearing natural rocks from the Hatrurim basin and Maale Adummim localities, Israel. Thanks are extended to Drs. N.S. Karmanov, E.N. Nigmatulina, and M.V. Khlestov (IGM, Novosibirsk) who performed the analytical work. The work was supported by a grant from RFBR (12-05-00057).

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Authors and Affiliations

  1. Institute of Geology and Mineralogy SB RAS, Pr. Ak. Koptyuga 3, 630090, Novosibirsk, Russia

    V. A. Drebushchak, Yu V. Seryotkin, Svetlana N. Kokh & Ella V. Sokol

  2. Novosibirsk State University, Ul. Pirogova 2, 630090, Novosibirsk, Russia

    V. A. Drebushchak & Yu V. Seryotkin

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  1. V. A. Drebushchak
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  2. Yu V. Seryotkin
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  3. Svetlana N. Kokh
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  4. Ella V. Sokol
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Correspondence to V. A. Drebushchak.

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Drebushchak, V.A., Seryotkin, Y.V., Kokh, S.N. et al. Natural specimen of triple solid solution ettringite–thaumasite–chromate-ettringite. J Therm Anal Calorim 114, 777–783 (2013). https://doi.org/10.1007/s10973-013-2989-3

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  • DOI: https://doi.org/10.1007/s10973-013-2989-3

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