Some varieties contain titanium. Often as prismatic crystals with a rectangular or octagonal cross section. Also occurs in short, stubby crystals, grainy , columnar , massive , fibrous , in twins , and in disordered aggregates of rectangular crystals.
Crystals are partially hollow in some localities.
Translucent in thin splinters. May also exhibit parting in one direction. Strictly speaking, Augite is not a single mineral, but a group of closely related minerals identical in structure but containing different percentages of certain elements. However, Augite is scientifically recognized as one mineral species. Augite is an important rock-forming mineral, and large crystals are fairly common.