dacite - a gray volcanic rock containing plagioclase and quartz and other crystalline minerals

basalt - the commonest type of solidified lava; a dense dark gray fine-grained igneous rock composed chiefly of calcium-rich plagioclase feldspar and pyroxene

feldspar, felspar - any of a group of hard crystalline minerals that consist of aluminum silicates of potassium or sodium or calcium or barium

albite, white feldspar - a widely distributed rock-forming feldspar

anorthite - rare plagioclastic feldspar occurring in many igneous rocks