Brightly Fluorescent and Radioactive Andersonite from Utah

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.

10 views0 comments

Email comments or suggestions:


Nature’s Rainbows is a non-commercial web site maintained entirely by volunteer hobbyists and contributors.  Our mission is to provide information about UV and luminescence, premium fluorescent mineral photos, and a fluorescent mineral database for the enjoyment of FL mineral collectors around the world.  Information on this web site is covered under a Creative Commons License.

Feel free to contact us with comments and suggestions.

Like us on Facebook!

  • reddit
  • Facebook Social Icon

Subscribe to our RSS (Real Simple Syndication) feed to get new posts delivered directly to your desktop!