Boulder Opal - Naica Mine, Chihuahua, Mexico
Contributed by: Mark Cole
Date: Mar 24th, 2026
Locality: Naica Mine, Naica, Saucillo Municipality, Chihuahua, Mexico (See on Mindat)
Description:
Originally posted by Mark Cole on Nature's Rainbows in 2015.
Summary of luminescence responses:
Opal-AN (Mindat) (RRUFF)
- Fluorescence under Shortwave (254nm Lamp/Mercury) UV light: Green