Abstract
The paper reports original thermochemical data on six natural amphibole samples of different composition. The data were obtained by high-temperature melt solution calorimetry in a Tian–Calvet microcalorometer and include the enthalpies of formation from elements for actinolite Ca1.95(Mg4.4Fe 2+0.5 Al01)[Si8.0O22](OH)2(–12024 ± 13 kJ/mol) and Ca2.0(Mg2.9Fe 2+1.9 Fe 3+0.2 )[Si7.8Al0.2O22](OH)2, (–11462 ± 18 kJ/mol), and Na0.1Ca2.0(Mg3.2Fe 2+1.6 Fe 3+0.2 )[Si7.7Al0.3O22](OH)2 (–11588 ± 14 kJ/mol); for pargasite Na0.5K0.5Ca2.0-(Mg3.4Fe 2+1.8 Al0.8)[Si6.2Al1.8O22](OH)2 (–12316 ± 10 kJ/mol) and Na0.8K0.2Ca2.0(Mg2.8Fe 3+1.3 Al0.9) [Si6.1Al1.9O22](OH)2 (–12 223 ± 9 kJ/mol); and for hastingsite Na0.3K0.2Ca2.0(Mg0.4Fe 2+1.3 Fe 3+0.9 Al0.2) [Si6.4Al1.6O22](OH)2 (‒10909 ± 11 kJ/mol). The standard entropy, enthalpy, and Gibbs free energy of formation are estimated for amphiboles of theoretical composition: end members and intermediate members of the isomorphic series tremolite–ferroactinolite, edenite–ferroedenite, pargasite–ferropargasite, and hastingsite.
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Original Russian Text © L.P. Ogorodova, I.A. Kiseleva, M.F. Vigasina, L.V. Mel’chakova, I.A. Bryzgalov, D.A. Ksenofontov, 2017, published in Geokhimiya, 2017, No. 9, pp. 824–831.
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Ogorodova, L.P., Kiseleva, I.A., Vigasina, M.F. et al. Thermodynamic study of calcic amphiboles. Geochem. Int. 55, 814–821 (2017). https://doi.org/10.1134/S0016702917080067
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DOI: https://doi.org/10.1134/S0016702917080067