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Phase equilibrium relationships in igneous systems can be estimated using empirical mathematical models based on&#13; multi-component regular solution formulae. Although these provide useable results within the fitted region, they can&#13; give very misleading values outside the compositional range of curve fitting. Moreover, they usually give poor estimates&#13; of the well-characterized melting relations of simple systems and do not relate to the large body of thermodynamic&#13; activity data available in the metallurgical literature, nor to spectroscopic, diffraction or computational models&#13; of silicate melt properties. The aim of this paper is to extend previous acid-base models of silicate melts and to&#13; use a quasi-chemical model to calculate the activities of quasi-chemical silicate mixing units, or structons, from combinations&#13; of the oxo-species used in quasi-chemical and polymer models to calculate oxide activities in metallurgy

Acid-base properties and structons: towards a structural model for predicting the thermodynamic properties of silicate melts