The equilibrium conditions for the reversible reactions in which muscovite decomposes to K-feldspar, corundum, and water, and in which muscovite and quartz decompose to K-feldspar, and andalusite, sillimanite, or kyanite, and water, were found by a method that determines the rate of reaction as a function of temperature at fixed pressure.
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Bernard W. Evans (1965) studied this question.