Webster’s Revised Unabridged Dictionary · 1913
Augite
Au′gite (a̤′jīt), n. [L. augites, Gr. αὐγίτης, fr. αὐγή brightness: cf. F. augite.] A variety of pyroxene, usually of a black or dark green color, occurring in igneous rocks, such as basalt; — also used instead of the general term pyroxene.