Fig. 2. Aggregates of myrmekite (left side) formed around the plagioclase crystals (right side; albite twinned; white and gray) in diorite, which may have resulted from Ca-metasomatism of sodic plagioclase. (Quartz (cream; white). Biotite (brown). See also similar aggregates of myrmekite formed by Ca-metasomatism of K-feldspar in Finland (Fig. 6 in Collins, 1997b).