Abstract
A thermochemical study of natural apophyllite-group minerals, fluorapophyllite-(K) KCa4[Si8O20]F ⋅ 8H2O (Maharashtra, India) (I) and hydroxyapophyllite-(K) KCa4[Si8O20]OH ⋅ 8H2O (Norilsk, Russia) (II), was carried out on a high-temperature heat-flux Tian-Calvet Setaram (France) microcalorimeter using the melt solution calorimetry method. The first data on the enthalpies of formation from elements are obtained for the minerals studied: –13205 ± 13 kJ/mol (I) and –13054 ± 20 kJ/mol (II). The values of their standard entropies and Gibbs energies of formation are estimated.
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ACKNOWLEDGMENTS
We are grateful to prof. E.M. Spiridonov (Moscow State University, Geological Faculty) for given fluorapophyllite-(K) sample, attention to and support of this work, as well as the useful recommendations, which significantly improved this manuscript.
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Ogorodova, L.P., Melchakova, L.V., Vigasina, M.F. et al. Thermodynamic Properties of Fluorapophyllite-(K) and Hydroxyapophyllite-(K). Geochem. Int. 57, 805–811 (2019). https://doi.org/10.1134/S0016702919070097
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DOI: https://doi.org/10.1134/S0016702919070097