Sengierite
A variety of Minerals
What is Sengierite?
Sengierite is a rare oxide and hydroxide mineral, chemically a copper and uranyl vanadate, belonging to the carnotite group. Its chemical formula is Cu2(OH)2[UO2|VO4]2·6H2O. Sengierite was first discovered at the Luiswishi Mine about 20 km north of Lubumbashi in Katanga Province in the Democratic Republic of the Congo and was first described in 1949 by Johannes F. Vaes and Paul F. Kerr, the mineral was named after Edgar Sengier (1879–1963), a former Director of the Union Minière du Haut Katanga.
Market Value Factors
Pricing varies for every rock and mineral, so use these universal factors to gauge Sengierite 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
- Olive-green, yellowish green
- Hardness (Mohs)
- 2.5
- Rock tumbling
- Not recommended
- Density
- 4.1 g/cm³
- Streak
- Light green
Chemical Properties
- Chemical Formula
- Cu2(UO2)2(VO4)2 · 6H2O
- Elements
- Cu, H, O, U, V
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Sengierite FAQs
How do I identify Sengierite?
Sengierite can be identified by its hardness of 2.5 on the Mohs scale, Olive-green color. Look for these key characteristics when examining specimens.
What color is Sengierite?
Sengierite typically appears in Olive-green, yellowish green. Color can vary depending on impurities and formation conditions.
How hard is Sengierite?
Sengierite 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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