Celestine on Sulfur from Italy

Contributed by: Mark Cole
Date: Apr 6th, 2026
Locality: La Grasta Mine (Grasta Mine), Caltanissetta, Caltanissetta Province, Sicily, Italy (See on Mindat)
Size: 2 x 2 x 3.5 inches
Weight: 4.1 oz

Description:
Strongly phosphorescent with delicate crystals - from the La Grasta Mine, Sommatino, Caltanisseta, Sicily, Italy

Originally posted by Mark Cole on Nature's Rainbows in 2016.

Fluorescence under shortwave UV light.

Afterglow after exposure to shortwave UV light.

Normal light.

Normal light. Closeup

Fluorescence under shortwave UV light. Closeup

Afterglow after exposure to shortwave UV light. Closeup

Summary of luminescence responses:

Celestine (Mindat) (RRUFF)

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