Andersonite

andersonite

swartzite

shrockingerite

bayleyite

Images

Formula: Na2Ca(UO2)(CO3)3.5-6H2O
Hydrated normal carbonate
Specific gravity: 2.8
Hardness: 2½
Colour: Bright green to yellow-green
Luminescence: Fluorescent bright pastel green under shortwave and longwave UV
Solubility: Soluble in water
RADIOACTIVE
Environments

Sedimentary environments
Hydrothermal environments

Andersonite is an uncommon secondary mineral, formed in the oxidised zone of uranium-bearing hydrothermal polymetallic deposits; it may be post-mine, coating walls of mine tunnels. Associated minerals include schröckingerite, bayleyite, swartzite, boltwoodite, liebigite and gypsum (HOM).

Localities

At the type locality, the Hillside mine, Bozarth Mesa, Bagdad, Eureka Mining District, Yavapai County, Arizona, USA, andersonite occurs as a post-mining efflorescences on mine walls, associated with swartzite, schröckingerite, gypsum and bayleyite (Mindat, Dana).

At Mount Pisgah, Jim Thorpe, Carbon county, Pennsylvania, USA, andersonite is associated with liebigite and carnotite (Dana).

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