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- Title
Atacamite from the Paleofumaroles of Mount 1004, Tolbachik Volcano, Kamchatka: Thermodynamic Properties.
- Authors
Gritsenko, Yu. D.; Bulakh, M. O.; Ogorodova, L. P.; Vigasina, M. F.; Melchakova, L. V.; Ksenofontov, D. A.
- Abstract
Atacamite, empirical formula (Cu1.97Zn0.01)Cl0.94(OH)3.02, from the paleofumaroles of the monogenic volcano of Mount 1004, Tolbachik, Kamchatka, Russia, has been studied by thermal and electron microprobe analyses, X-ray powder diffraction, IR and Raman spectroscopy, and Calvet microcalorimetry. The thermal decomposition of atacamite was studied using X-ray diffraction and IR spectroscopy. The enthalpy of formation from elements for atacamite of the theoretical composition Cu2Cl(OH)3 (−810.2 ± 7.7 kJ/mol) was determined by melt dissolution calorimetry, and the Gibbs energy of formation (−657.0 ± 7.7 kJ/mol) was calculated. The stability of atacamite in the Cu–O–Cl–H system was thermodynamically modeled based on the obtained data, and the boundaries of its stability field were calculated under conditions of high alkalinity and high acidity of the mineral-forming medium.
- Subjects
KAMCHATKA Peninsula (Russia); THERMODYNAMICS; HEAT of formation; X-ray powder diffraction; ELECTRON probe microanalysis; GIBBS' free energy
- Publication
Geochemistry International, 2024, Vol 62, Issue 2, p172
- ISSN
0016-7029
- Publication type
Article
- DOI
10.1134/S001670292402006X