Brassite
A variety of Minerals
What is Brassite?
Brassite is a rare arsenate mineral with the chemical formula Mg(AsO3OH)·4(H2O). It was named brassite, in 1973, to honor French chemist R`ejane Brasse, who first synthesized the compound. The type locality for brassite is Jáchymov of the Czech Republic. It occurs as an alteration of magnesium carbonate minerals by arsenic bearing solutions. It occurs associated with pharmacolite, picropharmacolite, weilite, haidingerite, rauenthalite, native arsenic, realgar and dolomite.
Market Value Factors
Pricing varies for every rock and mineral, so use these universal factors to gauge Brassite 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.
Brassite Localities Map
See where Brassite is found with a localities map, collecting zones, and geology context. Generate a sample map preview below.
Quick Facts
Physical Properties
- Color
- White
- Density
- 2.326 g/cm³
- Streak
- White
Chemical Properties
- Chemical Formula
- Mg(HAsO4) · 4H2O
- Elements
- As, H, Mg, O
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Brassite FAQs
How do I identify Brassite?
Brassite can be identified by its White color. Look for these key characteristics when examining specimens.
What color is Brassite?
Brassite typically appears in White. Color can vary depending on impurities and formation conditions.
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