Solid phases - Specify possible solid phases. The same as Specify infinite solid phases
except that equilibrium is assumed to occur only if the concentrations of the species
involved are found to be sufficiently large; this will cause precipitation of the phase. In
the calculations, the program will equilibrate the solution with this phase absent, but if
it finds that the speciated solution is oversaturated with respect to this phase, MINTEQ
will recalculate the problem assuming that the water is in equilibrium with the phase.