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.

Autunite

A variety of Autunite Group

Rare

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.

Autunite Market Value Calculator

Estimate the market value of Autunite using size, quality, and finish. This preview calculator is for quick context and is not a formal appraisal.

Autunite Localities Map

See where Autunite is found with a localities map, collecting zones, and geology context. Generate a sample map preview below.

Map preview

North ZoneCentral RidgeSouth Basin

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

⚠️Harm Reason: Autunite is toxic due to its Radioactivity.
⚠️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.
⚠️How to prevent the risks of Autunite?