rock formed by the solidification of molten magma

a mineral or mineral variety belonging to the amphibole group

dark brown to black mica found in igneous and metamorphic rock

a hard glossy mineral consisting of silicon dioxide in crystal form; present in most rocks (especially sandstone and granite); yellow sand is quartz with iron oxide impurities

any of a series of triclinic feldspars that form rocks

a mineral or mineral variety belonging to the amphibole group

dark brown to black mica found in igneous and metamorphic rock

a hard glossy mineral consisting of silicon dioxide in crystal form; present in most rocks (especially sandstone and granite); yellow sand is quartz with iron oxide impurities

any of a series of triclinic feldspars that form rocks