pyroxene
py.rox.ene \pi--'ra:k-.se-n, p*-\ \.pi--.ra:k-'se-n-ik, p*-, -'sen-\ n [F pyroxe'ne, fr. Gk pyr- + xenos stranger] : any of a group of igneous-rock-forming silicate minerals that contain ca lcium, sodium, magnesium, iron, or aluminum, usu. occur in short prismatic crystals or massive, are often laminated, and vary in color from white to dark green or black - py.rox.e.nic aj