Augite is a clinopyroxene, part of a solid solution series. It is an intermediate member of diopside and hedenbergite. Crystal System: Monoclinic 2/m: Luster: Vitreous, translucent. Specific Gravity: 3.2 - 3.6 : Hardness: 5-6 : Color: Black to dark green in hand sample. Usually colorless, tan-gray, pale green, pale brown or brownish green in ...