Natural specimen of triple solid solution ettringite–thaumasite–chromate-ettringite |
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| Authors: | V A Drebushchak Yu V Seryotkin Svetlana N Kokh Ella V Sokol |
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| Institution: | 1. Institute of Geology and Mineralogy SB RAS, Pr. Ak. Koptyuga 3, 630090, Novosibirsk, Russia
2. Novosibirsk State University, Ul. Pirogova 2, 630090, Novosibirsk, Russia
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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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