Source : Webster's Revised Unabridged Dictionary (1913)

Augite \Au"gite\ ([add]"j[imac]t), n. [L. augites, Gr.
   a'ygi`ths, fr. a'ygh` 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.

Source : WordNet®

augite
     n : dark-green to black glassy mineral of the pyroxene group
         containing large amounts of aluminum and iron and
         magnesium