Rich Orange Fluorescent Calcite from Mexico
Contributed by: Mark Cole
Date: Apr 5th, 2026
Locality: Santa Eulalia Mining District, Aquiles Serdán Municipality, Chihuahua, Mexico (See on Mindat)
Size: 5 x 3.5 x 5 inches
Weight: 2.77 lb
Description:
Franklin calcite certainly wins the brightness contest but sometimes I find the color glaring. This piece is quite bright on its own but exhibits a rich orange color I find striking.
Shortwave fluorescent pictures were taken at ISO-100, f/11 for 2 seconds.
Originally posted by Mark Cole on Nature's Rainbows in 2016.
Summary of luminescence responses:
Calcite (Mindat) (RRUFF)
- Fluorescence under Shortwave (254nm Lamp/Mercury) UV light: Red