Andesite - an Intermediate volcanic rock Anorthosite - an intrusive igneous felsic rock composed predominantly of plagioclase Aplite - a very fine grained intrusive igneous rock Basalt - a volcanic rock of mafic composition Adakite - a class of basaltic rocks containing low yttrium and ytterbium Hawaiite - a class of basalts formed from ocean island (hot spot) magmatism. Basanite - a volcanic rock of mafic composition; essentially a silica undersaturated basalt
