Uranophane
A variety of Uranophane Group
What is Uranophane?
Uranophane (Ca(UO2)2(SiO3OH)2·5H2O), also known as uranotile, is a rare calcium uranium silicate hydrate mineral that forms from the oxidation of other uranium-bearing minerals. It has a yellow color and is radioactive.
Market Value Factors
Pricing varies for every rock and mineral, so use these universal factors to gauge Uranophane 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.
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Quick Facts
Physical Properties
- Color
- Light yellow, lemon-yellow, honey-yellow, straw-yellow, green-yellow
- Hardness (Mohs)
- 2 - 3
- Rock tumbling
- Not recommended
- Density
- 3.78 g/cm³
Chemical Properties
- Chemical Formula
- Ca(UO2)2(SiO3OH)2•5H2O
- Elements
- Ca, H, O, Si, U
Also Known As
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Uranophane FAQs
How do I identify Uranophane?
Uranophane can be identified by its hardness of 2 - 3 on the Mohs scale, Light yellow color. Look for these key characteristics when examining specimens.
What color is Uranophane?
Uranophane typically appears in Light yellow, lemon-yellow, honey-yellow, straw-yellow, green-yellow. Color can vary depending on impurities and formation conditions.
How hard is Uranophane?
Uranophane has a hardness of 2 - 3 on the Mohs scale. This makes it a soft mineral that can be scratched easily.