Email comments or suggestions:

Home

RSS Feed
  • reddit
  • Facebook Social Icon

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

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!

Opalized Volcanic Tuff, Burro Creek, Arizona

Light-colored, dendritic, brecciated opalized volcanic tuff (opalite) having a sponge like texture.  Contains weblike veins of hyalite opal (Opal-AN) that fluoresce bright green under SW UV, and dim green under LW UV.  This piece has a single cut surface that provides an excellent view of the interior.  The size of this specimen is 11.2 x 10.6 x 5.9 cm, and it weighs 430 grams.

Volcanic tuff is a type of rock formed by the compaction of volcanic ash, and the ash serves as a source of silica for the formation of the opal.  The green fluorescence of the opal is due to the inclusion of trace amounts of uranium in the form of the uranyl ion, which is brightly fluorescent under UV.

 

Please reload

Recent GlowNotes Posts

Please reload

Visit the GlowNotes Blog to view more - educational posts, equipment, minerals, photography and displays

Related Posts:

Please reload