Thermodynamic Properties of Pectolite

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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.

Sobre autores

L. Ogorodova

M.V.Lomonosov Moscow State University, Faculty of Geology

Email: logor48@mail.ru
119991, Moscow, Leninskie Gory

Yu. Gritsenko

M.V.Lomonosov Moscow State University, Faculty of Geology; Fersman Mineralogical Museum of Russian Academy of Science

Email: ygritsenko@rambler.ru
119991, Moscow, Leninskie Gory; 119962 Moscow Leninsky pr., 18

M. Vigasina

M.V.Lomonosov Moscow State University, Faculty of Geology

Email: ygritsenko@rambler.ru
119991, Moscow, Leninskie Gory

D. Ksenofontov

M.V.Lomonosov Moscow State University, Faculty of Geology

Email: ygritsenko@rambler.ru
119991, Moscow, Leninskie Gory

L. Melchakova

M.V.Lomonosov Moscow State University, Faculty of Geology

Autor responsável pela correspondência
Email: ygritsenko@rambler.ru
119991, Moscow, Leninskie Gory

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Declaração de direitos autorais © Л.П. Огородова, Ю.Д. Гриценко, М.Ф. Вигасина, Д.А. Ксенофонтов, Л.В. Мельчакова, 2023