Zippeite
A variety of Zippeite Group
What is Zippeite?
Zippeite is a hydrous potassium uranium sulfate mineral with formula: K4(UO2)6(SO4)3(OH)10·4(H2O). It forms yellow to reddish brown monoclinic-prismatic crystals with perfect cleavage. The typical form is as encrustations and pulverulent earthy masses. It forms as efflorescent encrustations in underground uranium mines. It has a Mohs hardness of 2 and a specific gravity of 3.66. It is strongly fluorescent yellow under ultraviolet light and is moderately radioactive.
Market Value Factors
Pricing varies for every rock and mineral, so use these universal factors to gauge Zippeite 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
- Golden yellow, light yellow, orange-yellow
- Hardness (Mohs)
- 2
- Rock tumbling
- Not recommended
- Density
- 4.794 g/cm³
- Streak
- White, yellow
Chemical Properties
- Chemical Formula
- K3(UO2)4(SO4)2O3(OH) · 3H2O
- Elements
- H, K, O, S, U
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Zippeite FAQs
How do I identify Zippeite?
Zippeite can be identified by its hardness of 2 on the Mohs scale, Golden yellow color. Look for these key characteristics when examining specimens.
What color is Zippeite?
Zippeite typically appears in Golden yellow, light yellow, orange-yellow. Color can vary depending on impurities and formation conditions.
How hard is Zippeite?
Zippeite has a hardness of 2 on the Mohs scale. This makes it a soft mineral that can be scratched easily.