Augite

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Augite
Fassaïte.jpg
General
Category Silicate mineral
Formula
(repeating unit)
(Ca,Mg,Fe)SiO3
Identification
Color Pale brown to purplish or greenish brown, also dark grey sometimes
Crystal system Monoclinic
Cleavage {110} good
Fracture uneven
Mohs scale hardness 5 to 6.5
Luster Vitreous
Streak Greenish-white
Specific gravity 3.19 - 3.56
Refractive index α = 1.671 - 1.735, β = 1.672 - 1.741, γ = 1.703 - 1.774

Augite is a mineral. The mineral's name comes from the Greek word augites, meaning "brightness". However, augites only look shiny some of the time. Most augites have a dull (dark green, brown or black) color.

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