Liebigite

Specimen Origin: Schwarzwalder Mine (Colorado, USA)

The Schwarzwalder Mine, located in Jefferson County, Colorado, was one of the most productive uranium mines in the state, operating mainly during the mid-20th century. It became well known for its rich assemblage of secondary uranium minerals that formed in oxidized zones and along fractures in brecciated host rock. Liebigite from this mine occurs as bright yellow-green crystalline crusts and aggregates, often coating fractures and cavities, and is prized by collectors for both its striking fluorescence and its representation of Colorado’s uranium mineralization.

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Liebigite

Liebigite is a hydrous calcium uranyl carbonate mineral with the formula Ca₂UO₂(CO₃)₃·10–11H₂O. It typically forms soft, green to yellowish-green tabular crystals, crusts, or efflorescences with a vitreous to silky luster. Strongly fluorescent under UV light, it occurs as a secondary mineral in the oxidation zones of uranium deposits. Though fragile and water-sensitive, its vivid color and luminescence make it a highly desirable species among uranium mineral collectors.