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Stability of magadiite between 20 and 100°C

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Clays and Clay Minerals

Abstract

New experimental data with respect to the solubility of natural and synthesized magadiite at elevated temperatures and in alkaline solutions are presented. The results show that the solubility of magadiite increases according to the expression ln(Kmag) = −8146·T(K)−1 − 5.71 from 20 to 100°C (\((\Delta G_{\rm{R}}^0({{\rm{K}}_{{\rm{mag}}}}) = 19.6 \pm 0.3\) and \(\Delta H_{\rm{R}}^0({{\rm{K}}_{{\rm{mag}}}}) = 16.2 \pm 0.4\;{\rm{kcal}}\;{\rm{mo}}{{\rm{l}}^{ - 1}}\)). The experimental results and the related data from the literature suggest that the formation of magadiite may be favored by a decrease of temperature and pH (pH >9) as well by large amounts of Na+ ions and low ionic strength. These effects are related to the value of \(\Delta H_{\rm{R}}^0({{\rm{K}}_{{\rm{mag}}}})\), the distribution of dissolved silica species, the stoichiometry of magadiite, and the occurrence of negatively-charged species, respectively.

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Authors and Affiliations

  1. Institute of Engineering Geology and Applied Mineralogy, University of Technology, A-8010, Graz, Austria

    Martin Dietzel

  2. Research Institute for Electron Microscopy, Steyrergasse 17, A-8010, Graz, Austria

    Ilse Letofsky-Papst

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  1. Martin Dietzel
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  2. Ilse Letofsky-Papst
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Correspondence to Martin Dietzel.

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Dietzel, M., Letofsky-Papst, I. Stability of magadiite between 20 and 100°C. Clays Clay Miner. 50, 657–666 (2002). https://doi.org/10.1346/000986002320679387

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  • DOI: https://doi.org/10.1346/000986002320679387

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