Fluorannite
A variety of Biotite Group
What is Fluorannite?
Market Value Factors
Pricing varies for every rock and mineral, so use these universal factors to gauge Fluorannite 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.
Fluorannite Localities Map
See where Fluorannite is found with a localities map, collecting zones, and geology context. Generate a sample map preview below.
Quick Facts
Physical Properties
- Color
- Iron-black
- Hardness (Mohs)
- 3
- Streak
- Grey
Chemical Properties
- Chemical Formula
- KFe2+3(Si3Al)O10F2 F may be replaced by OH, leading to annite.
- Elements
- Al, F, Fe, K, O, Si
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Fluorannite FAQs
How do I identify Fluorannite?
Fluorannite can be identified by its hardness of 3 on the Mohs scale, Iron-black color. Look for these key characteristics when examining specimens.
What color is Fluorannite?
Fluorannite typically appears in Iron-black. Color can vary depending on impurities and formation conditions.
How hard is Fluorannite?
Fluorannite has a hardness of 3 on the Mohs scale. This makes it a soft mineral that can be scratched easily.