Fig. 3. This photograph shows megacrysts of pink microcline in a road cut along highway 105 south of Perrault Falls in western Ontario, Canada. Most geologists would consider the megacrysts to be primary and crystallized from a magma. These large K-feldspar crystals are bordered by myrmekite, however, and this granitic rock grades into adjacent, sheared and recrystallized, biotite-rich, diorite and gabbro. Potentially, these K-feldspar crystals could become rapakivi-type, if concentrations of myrmekite along borders were recrystallized as rims of sodic plagioclase and the quartz vermicules leaked outward to become quartz grains in the ground mass.