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A Method for Estimating the Standard Free Energy of Formation of Borate Minerals¹

ABSTRACT

An empirical method has been developed to estimate the standard free energy of formation (G^o_f,298) values for hydrated borate minerals. The method is completely general, and the only parameter used in the computation is the number of born atoms in the polyanion unit of a mineral. The standard free energy of formation values estimated by this method are within ± 10 kJ of the experimental data obtained from the literature. This method has fewer limitations than the structural method of Bassett.

¹ Contribution from the Dep. of Soil & Environmental Sciences, Univ. of California, Riverside, CA 92521.

² Assistant Professor.

Received for publication October 25, 1982. Accepted for publication March 8, 1983.