![9.2 Hornblende diorite. Salem, Massachusetts. White to dark gray plagioclase feldspar and brownish-black to black hornblende, both with generally irregular grain boundaries, dominate the rock. Sample courtesy of Sonoma State University Geology Department. [Standard cm scale provided.]](../9.2.JPG)
9.2 Hornblende diorite. Salem, Massachusetts. White to dark gray plagioclase feldspar and brownish-black to black hornblende, both with generally irregular grain boundaries, dominate the rock. Sample courtesy of Sonoma State University Geology Department. [Standard cm scale provided.]