An igneous rock, usually light gray in color and breaking with a rough surface. It consists chiefly of orthoclase feldspar with sometimes hornblende and mica.
A fine grained igneous rock consisting mainly of feldspars containing potassium, usually with mica, amphibole, and pyroxene but with little if any quartz. Sometimes glassy in nature. The fine grained equivalent of syenite.
Fine grained igneous rock equivalent in composition to a syenite. Contains a small amount of free quartz.