Calcite from Terlingua, Texas

Contributed by: Bart Pickard
Date: Mar 21st, 2026
Locality: Terlingua Mining District, Texas, USA (See on Mindat)

Description:
Originally posted by Bart Pickard on Nature's Rainbows in 2016.

Fluorescence under longwave UV light.

Fluorescence under shortwave UV light.

Normal light.

Summary of luminescence responses:

Calcite (Mindat) (RRUFF)

• Fluorescence under Longwave (365nm LED) UV light: Pink
• Fluorescence under Shortwave (254nm Lamp/Mercury) UV light: Blue