liebigite

Liebigite is a rare mineral composed of calcium uranium carbonate. Its chemical formula is Ca2(UO2)(CO3)3·3H2O. Liebigite typically occurs as pale green to yellow, fibrous or powdery masses. It is a secondary mineral, meaning it forms from the alteration of other uranium-bearing minerals. It is often found in arid or semi-arid environments within oxidized zones of uranium deposits.

The mineral was first discovered in the Šluknov district of Bohemia (now the Czech Republic) in 1860 and was named in honor of Justus von Liebig, a prominent German chemist. Liebigite is closely related to other uranium carbonate minerals, such as andersonite and wyartite, and can be difficult to distinguish from them without detailed chemical analysis.

Common associated minerals include other secondary uranium minerals, gypsum, and various carbonates. Due to its radioactivity, liebigite is considered a minor uranium ore, though its rarity and small crystal size limit its economic significance. It can be found in various uranium mining districts around the world, particularly in the United States and Europe.