Watermelon Calcite (Chalcedony and Calcite) - Crawford, Nebraska

Contributed by: Mark Cole
Date: Apr 4th, 2026
Locality: Crawford, Dawes County, Nebraska, USA (See on Mindat)

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

Fluorescence under shortwave UV light.

Summary of luminescence responses:

Calcite (Mindat) (RRUFF)

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

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