Delvauxite
A variety of Minerals
What is Delvauxite?
Delvauxite, also known as borickite, is a yellow to brown to dark brown amorphous mineral, sometimes forming a botryoidal mass. Its chemical formula is CaFe4(PO4,SO4)2(OH)8•(4-6)H2O. and it may sometimes form stalactites. It was first described in 1838 by Belgian chemist, Dumont and dedicate to J.S.P.J. Delvaux de Fenffe (1782–1863). It was found in Bernau, Liege, Belgium and Stredocesky, Czech republic.
Market Value Factors
Pricing varies for every rock and mineral, so use these universal factors to gauge Delvauxite 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.
Quick Facts
Physical Properties
- Color
- Yellowish brown, brownish black, reddish, chestnut-brown
- Hardness (Mohs)
- 2.5
- Rock tumbling
- Not recommended
- Density
- 1.85 g/cm³
- Streak
- Yellow, pale brown
Chemical Properties
- Chemical Formula
- CaFe4(PO4,SO4)2(OH)8 · 4-6H2O not confirmed
- Elements
- Ca, Fe, H, O, P, S
Also Known As
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Delvauxite FAQs
How do I identify Delvauxite?
Delvauxite can be identified by its hardness of 2.5 on the Mohs scale, Yellowish brown color. Look for these key characteristics when examining specimens.
What color is Delvauxite?
Delvauxite typically appears in Yellowish brown, brownish black, reddish, chestnut-brown. Color can vary depending on impurities and formation conditions.
How hard is Delvauxite?
Delvauxite has a hardness of 2.5 on the Mohs scale. This makes it a soft mineral that can be scratched easily.
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