Abstract
The discrepancy between the tabulated Gibbs Energies of Formation for Al2SiO5 and corundum relative to muscovite and kaolinite is considered to lie principally with the latter two minerals. New values for heat of formation of gibbsite [Gbs] will affect the tabulated ΔH 0f , ΔG 0f(298,1) for the other aluminous minerals which are referred to gibbsite as calorimetric aluminum reference. Gibbs Energy Difference Functions, calculated from phase equilibria in the system CaO-Al2O3-SiO2-(H2O-CO2), can be used to estimate consistent ΔH 0f , ΔG 0f(298,1) values for aluminous minerals. A self consistent data set is presented referred to ΔG 0f(298,1) [Corundum]=−378.08 kcal mol−1. Two independent values for ΔG 0f(298,1) [Anorthite]=−961.52 and −960.29 kcal, from a recalculation of the ΔH 0f [Anor] based upon the revised ΔH 0f(298,1) [Gbs]=−309.325 kcal mol−1 and from measurement of silica activity on the anorthite-saturated part of the CaO-Al2O3-SiO2 liquidus, respectively, are considered to show the magnitude of the discrepancy and are used in the calculations.
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Thompson, A.B. Gibbs energy of aluminous minerals. Contr. Mineral. and Petrol. 48, 123–136 (1974). https://doi.org/10.1007/BF00418614
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DOI: https://doi.org/10.1007/BF00418614