Abstract
Pyroxenes, like feldspars, occupy a position that is “chemically central to the composition realm of rocks” (Robinson, 1980) and occur ubiquitously in most part of igneous and metamorphic terrains. Understanding their crystal-chemical and thermodynamic properties is thus of primary importance in the earth sciences. Due to their importance in earth sciences, pyroxenes have been the object of various petrologic and thermodynamic investigations. Most published experimental data concern the pyroxene quadrilateral and have been restricted to the binary joins. The work of modeling multicomponent pyroxene mixtures using the binary solution data has begun only recently, and we wish to contribute to its development by presenting a series of structure-energy calculation procedures for the various phases of interest. This first work concerns the structural class C2/c that is the most representative of pyroxenes in nature and for which most crystal-chemical and thermodynamic data are available.
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Ottonello, G., Giusta, A.D., Negro, A.D., Baccarin, F. (1992). A Structure Energy Model for C2/c Pyroxenes in the System Na-Mg-Ca-Mn-Fe-Al-Cr-Ti-Si-O. In: Saxena, S.K. (eds) Thermodynamic Data. Advances in Physical Geochemistry, vol 10. Springer, New York, NY. https://doi.org/10.1007/978-1-4612-2842-4_7
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