Agate (in fossilized clay) - Superior, Arizona

Contributed by: Mark Cole
Date: Mar 28th, 2026
Locality: Superior, Pinal County, Arizona, USA (See on Mindat)

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

Fluorescence under shortwave UV light.

Normal light.

Fluorescence under shortwave UV light. Side 2

Summary of luminescence responses:

Chalcedony (Mindat) (RRUFF)

• Fluorescence under Shortwave (254nm Lamp/Mercury) UV light: Green