![8.1 Quartz-bearing hornblende syenite. Locality unknown. Gray, glassy quartz is scattered between white, gray, and pinkish gray alkali feldspar grains and a few similarly colored plagioclase grains. The dominant black minerals are hornblende, which occurs as irregular to rectangular grains, and biotite appearing as more equant, irregular grains. In addition, some magnetite or ilmenite is visible as tiny, black metallic grains. [Standard cm scale provided.]](../8.1.JPG)
8.1 Quartz-bearing hornblende syenite. Locality unknown. Gray, glassy quartz is scattered between white, gray, and pinkish gray alkali feldspar grains and a few similarly colored plagioclase grains. The dominant black minerals are hornblende, which occurs as irregular to rectangular grains, and biotite appearing as more equant, irregular grains. In addition, some magnetite or ilmenite is visible as tiny, black metallic grains. [Standard cm scale provided.]