Abstract—
A sample of natural thaumasite Ca3.0Si(OH)6(CO3)0.9(SO4)1.1·12.3H2O (N’Chwaning mine, Kalahari manganese ore field, South Africa) was studied by powder X-ray diffraction, infrared absorption and Raman spectroscopy, thermal analysis, and microcalorimetry. The process of thermal transformation of thaumasite was studied using the results of FTIR and Raman spectroscopy. The enthalpy of formation from elements ΔfH0(298.15 K) = −8816 ± 30 kJ/mol was determined by high-temperature melt solution calorimetry. The value of the absolute entropy was estimated, and the enthalpy and Gibbs energy of formation of thaumasite of theoretical composition were calculated: 945.4 ± 1.8 J/(mol K), −8699 ± 30 kJ/mol, −7577 ± 30 kJ/mol, respectively.
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ACKNOWLEDGMENTS
The authors thank Dr. V.O. Yapaskurt, the Head of the Laboratory of Analytical Techniques of High Spatial Resolution for conducting microprobe analysis of the thaumasite sample. We are thankful to the scientific editor M.V. Mironenko.
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This work was supported by ongoing institutional funding. No additional grants to carry out or direct this particular research were obtained.
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Translated by E. Kurdyukov
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Gritsenko, Y.D., Vigasina, M.F., Mel’chakova, L.V. et al. Thermal and Thermochemical Study of Thaumasite. Geochem. Int. 61, 1273–1282 (2023). https://doi.org/10.1134/S0016702923110046
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DOI: https://doi.org/10.1134/S0016702923110046