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: ΔfH0(298.15 K): −5799.1 ± 5.1 kJ/mol for saponite Ca0.1Na0.1K0.1(Mg2.6Fe0.12+Fe0.23+)[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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