Andersonite
Andersonite is a hydrated uranyl carbonate mineral that forms as tabular to prismatic crystals in uraniferous environments. It commonly presents a pale yellow to greenish hue and a vitreous to resinous lustre, frequently appearing in aggregates or crusts within oxidized uranium-rich rocks. Its characteristic hydration and carbonate groups help stabilize its structure, and specimens often reflect a delicate, glassy finish when well-formed.
- Formula
- Na2Ca(UO2)(CO3)3 · 6H2O
About Andersonite
Notable specimens have come from uranium-rich districts in the United States, where secondary minerals crystallize from oxidizing fluids in mine dumps and nearby environments. Andersonite’s association with uranyl carbonates places it among minerals collected by those seeking specimens with a strong geochemical signature and an interesting hydration state. Collectors prize clean, well-formed crystals and the overall aesthetic of light-colored, translucent faces that catch the light at angles, especially when embedded in matrix.
For collectors, Andersonite offers a window into secondary uranium minerals and the paragenesis of uranyl carbonate systems. Its rarity, coupled with the careful balance of hydration and crystallography, makes well-preserved pieces particularly appealing to those building a curated survey of uranyl minerals or seeking distinctive, scientifically informative specimens.