Demesmaekerite
A variety of Minerals
What is Demesmaekerite?
Demesmaekerite is a rare uranium selenite mineral with the chemical formula: Pb2Cu5(UO2)2(SeO3)6(OH)6·2H2O. It is named after the Belgian mineralogist Gaston Demesmaeker, who worked at the Musonoi Mine in Katanga. It is a secondary mineral which contains lead, copper and selenium, it is a bottle green to brown/yellow color, its crystal habit varies depending on where it is found. It can be found associated with other rare selenium-bearing uranium ores, such as haynesite, guilleminite, marthozite and piretite.
Market Value Factors
Pricing varies for every rock and mineral, so use these universal factors to gauge Demesmaekerite 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.
Demesmaekerite Localities Map
See where Demesmaekerite is found with a localities map, collecting zones, and geology context. Generate a sample map preview below.
Quick Facts
Physical Properties
- Color
- Translucent green
- Hardness (Mohs)
- 3 - 4
Chemical Properties
- Chemical Formula
- Pb2Cu5(UO2)2(SeO3)6(OH)6 · 2H2O
- Elements
- Cu, H, O, Pb, Se, U
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Demesmaekerite FAQs
How do I identify Demesmaekerite?
Demesmaekerite can be identified by its hardness of 3 - 4 on the Mohs scale, Translucent green color. Look for these key characteristics when examining specimens.
What color is Demesmaekerite?
Demesmaekerite typically appears in Translucent green. Color can vary depending on impurities and formation conditions.
How hard is Demesmaekerite?
Demesmaekerite has a hardness of 3 - 4 on the Mohs scale. This makes it a soft mineral that can be scratched easily.
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