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Mineralpedia Details for Andersonite

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Andersonite

Andersonite

Named for the geologist who gathered the first samples, Charles Alfred Anderson of the United States Geological Survey. Andersonite is an uncommon to rare mineral that occurs in oxidized uranium-bearing hydrothermal polymetallic deposits and can also be of post-mine in origin as coatings on the mine walls. Localities for Andersonite include in the United States, Austria, England, Sweden, the Czech Republic, and Argentina, among only a few others. Andersonite is quite radioactive and will brightly fluoresce a pale- to yellow-green under both short-wave and long0wave ultraviolet light. Andersonite is soluble in water.

Ref. Handbook of Mineralogy, Anthony et al (1995) and MSA at http://www.handbookofmineralogy.org/pdfs/andersonite.pdf

Formula
Na2Ca(UO2)(CO3)3ยท6H2
Crystal System
Trigonal 
Crystal Habit
Druse, Rhombohedral Crystals, Pseudo Cubic 
Luster
Vitreous - Pearly 
Color
bright yellow green, green 
Class
Trigonal - Rhombohedral 
Hardness
2.5 
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Andersonite from Atomic King mine, San Juan Co, Utah, United States

Andersonite
            from Atomic King mine, San Juan Co, Utah, United States

Thin "veneer " of bright green Andersonite on Sandstone.

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Andersonite from Grants dist., McKinley Co., New Mexico, United States

Andersonite
            from Grants dist., McKinley Co., New Mexico, United States
Special Info
Radioactive!!

A large specimen of naturally fluorescent Andersonite. It glows in the sun and turns green and switches back to yellow under fluorescent lights. The crystals exhibit an efflorescent look perhaps from a coating of gyspsum, which protects the Andersonite. 

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