Li-Tosudite: X-Ray Diffraction,IR Spectroscopic,Thermal, and Thermochemical Studies |
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| Authors: | L P Ogorodova M F Vigasina E A Vlasov L V Mel’chakova V V Krupskaya E M Spiridonov |
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| Institution: | 1.Geological Faculty,Moscow State University,Moscow,Russia;2.Institute of the Geology of Ore Deposits, Petrography, Mineralogy, and Geochemistry (IGEM),Russian Academy of Sciences,Moscow,Russia |
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| Abstract: | The paper reports data obtained in the course of a comprehensive physicochemical study of Li-tosudite, a mixed-layer mineral from hydrothermally altered rocks in western Chukotka, Russia, whose formula was reliably established. The enthalpy of formation of Li-tosudite from Chukotka, Ca0.15(Li0.9Mg0.2Al6.0)Si6.4Al1.6O20](OH)10 · 3.3H2O, from elements was experimentally determined by melt solution calorimetry in a high-temperature Calvet microcalorimeter: ΔfH el o (298.15 К) =–15087 ± 26 kJ/mol. The standard entropy and Gibbs free energy of formation of this mineral were evaluated. |
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