Abstract
The enthalpies of formation of natural trioctahedral smectite from elements were determined for the first time by high-temperature melt solution calorimetry using Tian-Calvet microcalorimeter: Δ f H 0(298.15 K): −5799.1 ± 5.1 kJ/mol for saponite Ca0.1Na0.1K0.1(Mg2.6Fe 2+0.1 Fe 3+0.2 )[Si3.6Al0.4O10](OH)2 (Arkhangelsk diamond province) and −5937.3 ± 6.0 kJ/mol for saponite Ca0.4(Mg2.6Al0.2)[Si3.4Al0.6O10](OH)2 (Mt. Kukisvumchorr, Khibiny). The enthalpies of formation of magnesian and magnesium-iron saponites of theoretical composition were estimated.
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Original Russian Text © L.P. Ogorodova, I.A. Kiseleva, L.V. Mel’chakova, M.F. Vigasina, V.V. Krupskaya, V.V. Sud’in, 2015, published in Geokhimiya, 2015, No. 7, pp. 617–623.
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Ogorodova, L.P., Kiseleva, I.A., Mel’chakova, L.V. et al. Calorimetric determination of the enthalpy of formation of natural saponite. Geochem. Int. 53, 617–623 (2015). https://doi.org/10.1134/S0016702915070071
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DOI: https://doi.org/10.1134/S0016702915070071