“…For the A-poor coal ash sample, a few minerals, such as grossular, ferrian and wollastonite-1A, ferrian, which formed under the nonequilibrium conditions, were not identified under the equilibrium conditions. Grossular, wollastonite, and anorthite can be converted to one another. , Generally, wollastonite is a transient phase . Occurrence of grossular may be because of the nonuniform spatial distribution of components .…”