Mineralogy. the process of exsolving.

< Latin exsolūtiōn- (stem of exsolūtiō). See ex-1, solution

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in mineralogy, process through which an initially homogeneous solid solution separates into at least two different crystalline minerals without the addition or removal of any materials. In most cases, it occurs upon cooling below the temperature of mutual solubility or stability of the solution. The sodium-rich feldspar albite (NaAlSi3O8) and the potassium-rich feldspar orthoclase (KAlSi3O8), for example, may exist in a homogeneous solid solution above 650 C (1,200 F), but below that temperature exsolution will occur.

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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Example sentences
The exsolution of dissolved gases may act to buffer the redox potential of the pore water.
These overpressures are consistent with either vapor exsolution from decompressed magma or rapid heating of groundwater.
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