Augite
A variety of Clinopyroxene Subgroup
Uncommon
What is Augite?
Augite is known for its luster and gets its name from the Greek word "augites," which means "brightness." It is often found amongst igneous and metamorphic rocks. Augite does not have properties that are commercially useful but is of interest to geologists and collectors.
Optical Properties
- Refractive Index
- 1.671-1.774
- Pleochroism
- Pale green/pale brown/green/greenish yellow, pale brown/pale yellow-green/violet, pale green/grayish green/violet
- Optical Character
- Biaxial positive
Augite Market Value Calculator
Estimate the market value of Augite using size, quality, and finish. This preview calculator is for quick context and is not a formal appraisal.
Augite Localities Map
See where Augite is found with a localities map, collecting zones, and geology context. Generate a sample map preview below.
Map preview
North ZoneCentral RidgeSouth Basin
More Images
© Robert M. Lavinsky
Quick Facts
Physical Properties
- Color
- Brown-green, black, green-black, brown, purplish brown
- Hardness (Mohs)
- 5.5 - 6
- Density
- 3.19 - 3.56 g/cm³
- Streak
- Greenish gray, light to dark brown
- Luster
- Vitreous
- Crystal System
- Monoclinic
Chemical Properties
- Chemical Formula
- (CaxMgyFez)(Mgy1Fez1)Si2O6
- Elements
- Ca, Fe, Mg, O, Si
Also Known As
AugiteViolatiteVolcanic ShorlHedenbergite-Agirin
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