Augite (Clinopyroxene)   Note the inclined extinction which is diagnostic of clinopyroxene. Also note the pigeonite twin lamellae in this grain. Pigeonite is a Ca-poor clinopyroxene. Contrast clinopyroxene's inclined extinction with orthopyroxene's parallel extinction.		UNC sample "norite" card
		Rock type clinopyroxenite
		Locality West Point, GA