Augite
A variety of Clinopyroxene Subgroup
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
Market Value Factors
Pricing varies for every rock and mineral, so use these universal factors to gauge Augite before comparing listings or appraisals.
Size & Weight
Larger, intact specimens usually command higher prices.
Rarity & Demand
Scarce material or popular varieties sell at a premium.
Condition & Finish
Chips, repairs, and heavy wear lower value; clean prep helps.
Treatment & Provenance
Untreated specimens with documented locality are prized.
Augite Localities Map
See where Augite is found with a localities map, collecting zones, and geology context. Generate a sample map preview below.
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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
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Augite FAQs
How do I identify Augite?
Augite can be identified by its hardness of 5.5 - 6 on the Mohs scale, Brown-green color, Vitreous luster, Monoclinic crystal system. Look for these key characteristics when examining specimens.
What color is Augite?
Augite typically appears in Brown-green, black, green-black, brown, purplish brown. Color can vary depending on impurities and formation conditions.
How hard is Augite?
Augite has a hardness of 5.5 - 6 on the Mohs scale. This gives it moderate hardness.
