In this example, the precipitation of phases as a result of
incongruent dissolution of K-feldspar (microcline) is investigated. Only the
four phases originally addressed by Helgeson and others (1969)–K-feldspar,
gibbsite, kaolinite, and K-mica (muscovite)–are considered. The
thermodynamic data for the phases (PHASES keyword) are derived from Robie
and others (1978) and are the same as for test problem 5 in the PHREEQE
manual (Parkhurst and others, 1980). The example can be run using the
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