Augite
Common rock-forming pyroxene mineral
Augite
Augite, also known as Augurite, is a common rock-forming pyroxene mineral with formula (Ca,Na)(Mg,Fe,Al,Ti)(Si,Al)2O6. The crystals are monoclinic and prismatic. Augite has two prominent cleavages, meeting at angles near 90 degrees.
Read on Wikipedia · Image Didier Descouens, CC BY-SA 4.0
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