Brightly Fluorescent and Radioactive Andersonite from Utah

27.9.2016

Brightly fluorescent andersonite with a minor metamunirite druse, from the D Day #2 Mine, Yellow Cat District, Grand County, Utah.  Andersonite is a rare secondary uranium carbonate mineral that forms as small bright to dull yellowish green colored translucent rhombohedral crystals, and as fine-grained drusy crystal aggregates.  Being a uranium-containing mineral, andersonite is radioactive and is brightly fluorescent, showing a brilliant blue/green response under both short wave and long wave UV.  The radioactivity of this specimen is approximately 1800 cpm at 1 cm.  Size is 4.3 x 3.8 x 1.3 cm.

 

 

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