Fig. 17. Photomicrograph of deformed and fractured plagioclase in a plane of a granodiorite stringer in Marlboro plagioclase amphibolite in which the plagioclase has irregular islands of K-feldspar in the interior of the plagioclase crystal. Surrounding the crystals are smaller grains of plagioclase, quartz, biotite, and hornblende in the plagioclase amphibolite wall rock of the stringer.