Rosenbergite
A variety of Minerals
What is Rosenbergite?
Rosenbergite is a mineral with the chemical formula AlF3·3H2O. It is a trihydrate of aluminium fluoride. It is colorless. Its crystals are tetragonal to dipyramidal. It is named after Philip E. Rosenberg, a United States geochemist. It is found in the Celtine Mine in Tuscany, Italy and Mount Erebus, Ross Island, Antarctica. It is not radioactive. Rosenbergite is rated 3–3.5 on the Mohs Scale.
Market Value Factors
Pricing varies for every rock and mineral, so use these universal factors to gauge Rosenbergite 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.
Rosenbergite Localities Map
See where Rosenbergite is found with a localities map, collecting zones, and geology context. Generate a sample map preview below.
Quick Facts
Physical Properties
- Color
- Colorless
- Hardness (Mohs)
- 3 - 3.5
- Density
- 2.111 g/cm³
- Streak
- Colroless
Chemical Properties
- Chemical Formula
- AlF[F0.5(H2O)0.5]4·H2O May also be given as AlF3·3H2O.
- Elements
- Al, F, H, O
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Rosenbergite FAQs
How do I identify Rosenbergite?
Rosenbergite can be identified by its hardness of 3 - 3.5 on the Mohs scale, Colorless color. Look for these key characteristics when examining specimens.
What color is Rosenbergite?
Rosenbergite typically appears in Colorless. Color can vary depending on impurities and formation conditions.
How hard is Rosenbergite?
Rosenbergite has a hardness of 3 - 3.5 on the Mohs scale. This makes it a soft mineral that can be scratched easily.
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