Fig. 7. In this photomicrograph, microcline (gray, top and left side) has replaced deformed plagioclase (tan, center) in the Cape Ann granite. Albite twins are bent and fractured, and K-feldspar replaces the plagioclase in irregular veins at top right of plagioclase and on left side. The gently-inclined, broad, black area is a fracture (hole) in the thin section. (See Fig. 4a and Fig. 4b in next presentation for photos of drill cores of Cape Ann granite.)