Autunite
A variety of Autunite Group
What is Autunite?
Autunite is famous for have radioactive properties, although its radioactivity is very low in a non-agitated state. It is still strongly discouraged to handle without proper protection, though! This mineral is rich in uranium, which is extracted to be used in nuclear reactors to create energy.
Etymology & Origins
Autunite was named after the town of Autun, France, where the mineral was initially found. The mineral was named by Henry J. Brooke and William H. Miller in 1854. The archaic name "calco-uranite" pairs with the similarly composed mineral, torbernite, which was named "cupro-uranite". Both minerals are named due to their uranium content, with autunite's name referring to its calcium (calco), and torbernite's copper (cupro) quantity.
Uses & Applications
Autunite has a moderately high level of uranium in it, and it is therefore used an a uranium ore. Its products are used for nuclear fission and to make cathodes for photoelectric tubes. It can create a beautiful reddish-yellow pigment that was once used in ceramic glazes.
Market Value Factors
Pricing varies for every rock and mineral, so use these universal factors to gauge Autunite 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.
Autunite Localities Map
See where Autunite is found with a localities map, collecting zones, and geology context. Generate a sample map preview below.
Key Characteristics
Characteristics of Autunite
If the mineral dries out, it can lose its water content and convert to meta-autunite-I, which can turn into meta-autunite-II after heating. These two subsequent minerals are very rare in nature. For scientific studies it is recommended to store the mineral in a sealed container to minimize the water loss. Museums are known to have covered the mineral with lacquer to avoid drying of the mineral.
Health & Safety Information
- ⚠️Autunite is toxic due to its Radioactivity.
- ⚠️Autunite contains radioactive uranium. Radioactivity should be assessed using a Geiger counter before handling. Inhalation of the dust, or keep them by your side for a long time will be hazardous. Keep them in a closed box and in an well-ventilated place. Wash your hand after handling them.
- ⚠️Autunite contains radioactive uranium. It is recommended to use a Geiger counter to measure radiation levels before handling. Wear gloves and a mask to prevent skin and lung exposure to radioactive dust. Wash your hands and clothes after handling it. Store it in a closed box in a well-ventilated area away from people.
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Quick Facts
Physical Properties
- Color
- Yellow, greenish-yellow, pale green, dark green, greenish black
- Hardness (Mohs)
- 2 - 2.5
- Density
- 3.14 g/cm³
- Streak
- Pale yellow
- Luster
- Pearly, Resinous, Waxy, Sub-vitreous
- Crystal System
- Orthorhombic
Chemical Properties
- Chemical Formula
- Ca(UO2)2(PO4)2 · 10-12H2O
- Elements
- Ca, H, O, P, U
Also Known As
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Autunite FAQs
How do I identify Autunite?
Autunite can be identified by its hardness of 2 - 2.5 on the Mohs scale, Yellow color, Pearly, Resinous, Waxy, Sub-vitreous luster, Orthorhombic crystal system. Look for these key characteristics when examining specimens.
What color is Autunite?
Autunite typically appears in Yellow, greenish-yellow, pale green, dark green, greenish black. Color can vary depending on impurities and formation conditions.
How hard is Autunite?
Autunite has a hardness of 2 - 2.5 on the Mohs scale. This makes it a soft mineral that can be scratched easily.
What is the characteristics of autunite of Autunite?
If the mineral dries out, it can lose its water content and convert to meta-autunite-I, which can turn into meta-autunite-II after heating. These two subsequent minerals are very rare in nature. For scientific studies it is recommended to store the mineral in a sealed container to minimize the water loss. Museums are known to have covered the mineral with lacquer to avoid drying of the mineral.
