Abstract
The heats of formation of zoisite, muscovite, and anorthite were determined by acid-solution calorimetry in a mixture of 20 per cent HC1-5 per cent HF. A new method of correcting the measured heats of solution for impurities is developed. This method is used to correct both the author's measurements and the heats of formation of muscovite, anorthite, and orthoclase measured by previous workers. The new correction method results in much better agreement between all the heats of formation. The values obtained are used to calculate the univariant equilibrium curves for the following reactions; (1) Mu = Or + Cn + V, (2) Mu + Qz = Or + Sil + V, and (3) 2 Zo + Sil + Qz = 4 An + V. These curves are compared with curves obtained by direct experiment.
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