Felsőbányaite
A variety of Minerals
What is Felsőbányaite?
Felsőbányaite or basaluminite is a hydrated aluminium sulfate mineral with formula: Al4(SO4)(OH)10·4H2O. It is a rare white to pale yellow mineral which typically occurs as globular masses and incrustations or as minute rhombic crystals. It crystallizes in the monoclinic crystal system. It occurs as a weathering product under acidic conditions associated with pyrite or marcasite decomposition. Associated minerals include hydrobasaluminite, hydroargillite, meta-aluminite, allophane, gibbsite, gypsum and aragonite. Felsőbányaite was first described in 1853 for an occurrence in the Baia Sprie mine, Baia Sprie (Felsőbánya), Maramureș County, Romania, and named for the locality. The mineral name basaluminite was used for an occurrence of the same mineral in England in 1948 and discredited by the International Mineralogical Association (IMA) in 2006.
Market Value Factors
Pricing varies for every rock and mineral, so use these universal factors to gauge Felsőbányaite 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.
Felsőbányaite Localities Map
See where Felsőbányaite is found with a localities map, collecting zones, and geology context. Generate a sample map preview below.
Quick Facts
Physical Properties
- Color
- Colourless, yellow, white; colourless in transmitted light.
- Hardness (Mohs)
- 1.5
- Density
- 2.2 g/cm³
Chemical Properties
- Chemical Formula
- Al4(SO4)(OH)10 · 4H2O
- Elements
- Al, H, O, S
Also Known As
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Felsőbányaite FAQs
How do I identify Felsőbányaite?
Felsőbányaite can be identified by its hardness of 1.5 on the Mohs scale, Colourless color. Look for these key characteristics when examining specimens.
What color is Felsőbányaite?
Felsőbányaite typically appears in Colourless, yellow, white; colourless in transmitted light.. Color can vary depending on impurities and formation conditions.
How hard is Felsőbányaite?
Felsőbányaite has a hardness of 1.5 on the Mohs scale. This makes it a soft mineral that can be scratched easily.
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