Autunite from France
Specimen Origin: Les Oudots Mine (Saône-et-Loire, France)
The Les Oudots Quarry (also called Les Oudots Mine or Carrière des Oudots), located near Marly-sous-Issy in the Saône-et-Loire department of the Bourgogne-Franche-Comté region, was an open-pit uranium mine active mainly between 1980 and 1982. It is renowned for producing world-class autunite specimens, characterized by neon yellow-green tabular crystals on granitic rock. These specimens are highly fluorescent, radioactive, and prized by collectors for their vivid color, crystal quality, and geological significance.
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Autunite
Autunite is a yellow-green, fluorescent, and radioactive phosphate mineral with the formula Ca(UO₂)₂(PO₄)₂·10–12H₂O. It forms tabular, mica-like crystals, often as crusts or foliated aggregates. With about 48% uranium by weight, it occurs as an oxidation product of uranium minerals such as uraninite, and glows bright yellow-green under UV light.
