Thermodynamic Properties of Pectolite

L. P. Ogorodova; Огородова Л. П.; Yu. D. Gritsenko; Гриценко Ю. Д.; M. F. Vigasina; Вигасина М. Ф.; D. A. Ksenofontov; Ксенофонтов Д. А.; L. V. Melchakova; Мельчакова Л. В.

doi:10.31857/S0016752523010053

Thermodynamic Properties of Pectolite

Authors: Ogorodova L.P.¹, Gritsenko Y.D.¹^,2, Vigasina M.F.¹, Ksenofontov D.A.¹, Melchakova L.V.¹
Affiliations:
1. M.V.Lomonosov Moscow State University, Faculty of Geology
2. Fersman Mineralogical Museum of Russian Academy of Science
Issue: Vol 68, No 1 (2023)
Pages: 83-89
Section: Articles
URL: https://journals.rcsi.science/0016-7525/article/view/134781
DOI: https://doi.org/10.31857/S0016752523010053
EDN: https://elibrary.ru/IALNIT
ID: 134781

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Abstract
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Abstract

Pectolite H1.00Na0.96Ca2.00Mn2+0.02Si3.00O9 from nepheline−feldspathic veins in the Kovdor massif, Kola Peninsula, Russia, was studied by X-ray diffraction (XRD), IR and Raman spectrometry, microprobe analysis (EPMA), and thermal analysis. The enthalpy of formation of pectolite HNaCa2Si3O9.from elements ∆fH° (298.15 K) = –4651.0 ± 4.3 kJ/mol was determined by melt solution calorimetry on a Setaram Tian–Calvet (France) microcalorimeter. The enthalpy of formation of serandite HNaMn2Si3O9, the manganese end member of the pectolite–serandite isomorphic series, was determined to be ΔH(298.15 K) = −4052.6 ± 4.4 kJ/mol. The absolute entropies and Gibbs energies of pectolite and serandite were calculated.

Keywords

pectolite, serandite, X-ray powder diffraction, IR spectroscopy, Raman spectroscopy, thermal analysis, Calvet microcalorimetry, enthalpy, Gibbs energy

References

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