incongruent dissolution

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incongruent dissolution Dissolution of a mineral with decomposition or reaction in the presence of a liquid, converting one solid phase into another, e.g. the conversion of orthoclase (see ALKALI FELDSPAR) to kaolinite: 2KAlSi3O8 + 11H2O → Al2Si2O5(OH)4 + 4Si(OH)4 + 2K+ + 20H.