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Дата последнего поиска статьи во внешних источниках: 17 октября 2017 г.
Аннотация: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 Ca-1.95(Mg4.4Fe0.52+Al01)[Si8.0O22](OH)(2)(-12024 +/- 13 kJ/mol) and Ca-2.0(Mg-2.9 Fe1.92+Fe0.23+ )[Si7.8Al0.2O22](OH)(2), (-11462 +/- 18 kJ/mol), and Na0.1Ca2.0(Mg-3.2 Fe1.62+Fe0.23+)[Si7.7Al0.3O22](OH)(2) (-11588 +/- 14 kJ/mol); for pargasite Na0.5K0.5Ca2.0-(Mg3.4Fe1.82+Al0.8)[Si6.2Al1.8O22](OH)(2) (-12316 +/- 10 kJ/mol) and Na0.8K0.2Ca2.0(Mg-2.8 Fe1.33+Al0.9)[Si6.1Al1.9O22](OH)(2) (-12 223 +/- 9 kJ/mol); and for hastingsite Na0.3K0.2Ca2.0(Mg-0.4 Fe-1.3(2+) Fe0.93+Al0.2)[Si6.4Al1.6O22](OH)(2) (aEuro'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.