Uranopilite
A variety of Minerals
What is Uranopilite?
Uranopilite is a minor ore of uranium with the chemistry (UO2)6SO4(OH)6O2·14H2O or, hydrated uranyl sulfate hydroxide. As with many uranyl minerals, it is fluorescent and radioactive. It is straw yellow in normal light. Uranopilite fluoresces a bright green under ultraviolet light. Uranopilite contains clusters of six uranyl pentagonal bipyramids that share equatorial edges and vertices, with the clusters cross-linked to form chains by sharing vertices with sulfate tetrahedra. In uranopilite, the chains are linked directly by hydrogen bonds, as well as to interstitial H2O groups. Uranopilite is associated with other uranyl minerals such as zippeite and johannite and, like them, is usually found as an efflorescent crust in uranium mines. Notable occurrences include: Wheal Owles, Cornwall, England San Juan County, Utah, US Northwest Territories, Canada Bohemian region of Europe
Market Value Factors
Pricing varies for every rock and mineral, so use these universal factors to gauge Uranopilite 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.
Uranopilite Localities Map
See where Uranopilite is found with a localities map, collecting zones, and geology context. Generate a sample map preview below.
Quick Facts
Physical Properties
- Color
- Bright yellow, straw-yellow; colourless to light yellow in transmitted light.
- Density
- 3.7 - 4 g/cm³
Chemical Properties
- Chemical Formula
- (UO2)6(SO4)O2(OH)6 · 14H2O Water content appears to be variable (12-14H2O).
- Elements
- H, O, S, U
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Uranopilite FAQs
How do I identify Uranopilite?
Uranopilite can be identified by its Bright yellow color. Look for these key characteristics when examining specimens.
What color is Uranopilite?
Uranopilite typically appears in Bright yellow, straw-yellow; colourless to light yellow in transmitted light.. Color can vary depending on impurities and formation conditions.
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