European Journal of Mineralogy
European Journal of Mineralogy
European Journal of Mineralogy
Articles | Volume 37, issue 6
Articles | Volume 37, issue 6
https://doi.org/10.5194/ejm-37-909-2025
© Author(s) 2025. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/ejm-37-909-2025
© Author(s) 2025. This work is distributed under
the Creative Commons Attribution 4.0 License.
Articles | Volume 37, issue 6
Research article
 | 
03 Dec 2025
Research article |  | 03 Dec 2025

Heat capacity and entropic mixing behaviour of the orthopyroxene solid solution (Mg,Fe)2Si2O6

Edgar Dachs, Artur Benisek, and Lado Cemič

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Short summary
Orthopyroxenes are important rock-forming minerals. They are solid solutions mainly between an Mg and a Fe endmember. Their thermodynamic properties are needed to model the P–T–X paths of igneous and metamorphic rocks. Samples along this Fe–Mg binary were synthesized at 800 °C/1.5 GPa, and their heat capacity was measured using calorimetric methods. From these data, the entropies along the solid solution could be derived, and it was found that this solution behaves thermodynamically ideally.
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