Augite, also known as Augurite, is a common rock-forming pyroxene mineral with formula (Ca,Na)(Mg,Fe,Al,Ti)(Si,Al)2O6.

With declining temperature, augite may exsolve lamellae of pigeonite and/or orthopyroxene.

It also occurs in relatively high-temperature metamorphic rocks such as mafic granulite and metamorphosed iron formations.

It commonly occurs in association with orthoclase, sanidine, labradorite, olivine, leucite, amphiboles and other pyroxenes.

[2] Occasional specimens have a shiny appearance that give rise to the mineral's name, which is from the Greek augites, meaning "brightness", although ordinary specimens have a dull (dark green, brown or black) luster.