Gabbro - a coarse grained plutonic rock composed of pyroxene and plagioclase basically equivalent to basalt Granite - a coarse grained plutonic rock composed of orthoclase, plagioclase and quartz Granodiorite - a granitic plutonic rock with plagioclase > orthoclase Granophyre - a subvolcanic intrusive rock of granitic composition Harzburgite - a variety of peridotite; an ultramafic cumulate rock Hornblendite - a mafic or ultramafic cumulate rock dominated by >90% hornblende