Bannisterite
A variety of Minerals
What is Bannisterite?
Market Value Factors
Pricing varies for every rock and mineral, so use these universal factors to gauge Bannisterite 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.
Bannisterite Localities Map
See where Bannisterite is found with a localities map, collecting zones, and geology context. Generate a sample map preview below.
Quick Facts
Physical Properties
- Color
- Dark brown
- Hardness (Mohs)
- 4
- Density
- 2.84 g/cm³
- Streak
- Creamy white
Chemical Properties
- Chemical Formula
- (Ca,K,Na)(Mn2+,Fe2+)10(Si,Al)16O38(OH)8 · nH2O n ~ 5.5
- Elements
- Al, Ca, Fe, H, K, Mn, Na, O, Si
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Bannisterite FAQs
How do I identify Bannisterite?
Bannisterite can be identified by its hardness of 4 on the Mohs scale, Dark brown color. Look for these key characteristics when examining specimens.
What color is Bannisterite?
Bannisterite typically appears in Dark brown. Color can vary depending on impurities and formation conditions.
How hard is Bannisterite?
Bannisterite has a hardness of 4 on the Mohs scale. This gives it moderate hardness.
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