Barite Crystals - Summitville, Colorado

Contributed by: Mark Cole
Date: Mar 17th, 2026
Locality: Summitville, Rio Grande County, Colorado, USA (See on Mindat)

Description:
Blue white fluorescence under SW light and green afterglow.

Originally posted by Mark Cole on Nature's Rainbows in 2015.

Fluorescence under shortwave UV light.

Afterglow after exposure to shortwave UV light.

Normal light.

Summary of luminescence responses:

Baryte (Mindat) (RRUFF)

• Fluorescence under Shortwave (254nm Lamp/Mercury) UV light: Blue
• Afterglow after exposure to Shortwave (254nm Lamp/Mercury) UV light: Green