A U G I T E
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Augite(Ca,Na)(Mg,Fe,Al,Ti)(SiAl)2O6
Class: Silicate Subclass: Pyroxene Hardness: 5.5 - 6 Density: 3.2 - 3.5 Streak: White or gray Lustre: Vitreous Habit: Small blocky grains. Colours: Dark-greeny black colour | | Crystal System: Monoclinic Cleavage: Good / Uneven Fracture: Uneven to conchoidal Magnetism: None Reaction with HCl: None | Identification in hand sample: Colour, cleavage and hardness are indicative of a pyroxene. Augite has 2 cleavage planes at 90°. Associations: Found in mafic to ultramafic rocks, and in high-grade metamorphs. Industrial / ecomonic uses: None. Comments: Often twinned. |