"Red" Sodalite (Hackmanite) - Deeply Tenebrescent Greenland

Red sodalite is named for the color it takes on when exposed to sunlight; it is nicely tenebrescent under longwave UV. Under shortwave UV the color deepens, in seconds, to almost black in some areas. This is probably the most dramatic example of tenebrescence in sodalite from anywhere. This process is easily reversed in seconds using a bright white light, and can be repeated over and over. (See the animation below).

Longwave fluorescence is a bright orange/yellow and the shortwave fluorescence shifts to a beautiful rusty orange (caused by the intense tenebrescence). The greenish fluorescence is typical of pieces found in this area within the Ilimaussaq Complex, and has not been identified.

Animation showing the tenebrescence after exposure to LW UV and SW UV

4 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!