Augite
ID: 60
Augite
Chemical Formula
(Ca,Na)(Mg,Fe,Al,Ti)(Si,Al)₂O₆
Hardness (Mohs)
5.5-6
Crystal System
Monoclinic
Streak
Greenish-gray
Luster
Vitreous to Dull
Diaphaneity
Translucent to Opaque
Color
Dark green, Black, Brown
Crystal Habit / Mode of Occurrence
Short Prismatic, Blocky, Granular, Massive.
Fun Facts
Augite is one of the most common pyroxene minerals and is a crucial indicator of the cooling history of volcanic rocks. (General formula for clinopyroxenes). Common Uses: Major component of many mafic and ultramafic igneous rocks (e.g., basalt, gabbro).