P3Y4R1O1X8E1N1E1
20 points
PYROXENE is validvalid
any of a group of minerals common in igneous rocks [n PYROXENES]
any of a group of minerals common in igneous rocks [n -S]
any of a group of minerals common in igneous rocks [n PYROXENES]
any of a group of minerals common in igneous rocks [n -S]