Calorimetric Study of Natural Anapaite

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Abstract

The thermochemical study of natural hydrous calcium and iron phosphate, anapaite Ca2Fe(PO4)2 · 4H2O (Kerch iron ore deposit, Crimea, Russia), was carried out using high-temperature melt solution calorimetry with a Tian-Kalvet microcalorimeter. The enthalpy of formation of the mineral from elements was obtained to be Δ fHel°(298.15 K) =–4812 ± 16 kJ/mol. The values of the standard entropy and the Gibbs energy of anapaite formation are S°(298.15 K) = 404.2 J/K mol and Δ fGel°(298.15 K) =–4352 ± 16 kJ/mol, respectively.

About the authors

L. P. Ogorodova

Geological Faculty

Author for correspondence.
Email: logor@geol.msu.ru
Russian Federation, Moscow, 119991

L. V. Melchakova

Geological Faculty

Email: logor@geol.msu.ru
Russian Federation, Moscow, 119991

M. F. Vigasina

Geological Faculty

Email: logor@geol.msu.ru
Russian Federation, Moscow, 119991

D. A. Ksenofontov

Geological Faculty

Email: logor@geol.msu.ru
Russian Federation, Moscow, 119991

I. A. Bryzgalov

Geological Faculty

Email: logor@geol.msu.ru
Russian Federation, Moscow, 119991

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