Diabase or dolerite - an intrusive mafic rock forming dykes or sills Diorite - a coarse grained intermediate plutonic rock composed of plagioclase, pyroxene and/or amphibole Dunite - a phaneritic ultramafic rock composed of more than 90% olivine, usually forsteritic Essexite - a silica undersaturated mafic plutonic rock (essentially a foid-bearing gabbro) Foidolite - a plutonic igneous rock composed of >90% feldspathoid minerals
