Calcite Crystals from Chihuahua, Mexico

Contributed by: Mark Cole
Date: Apr 11th, 2026
Locality: Chihuahua, Mexico (See on Mindat)

Description:
Had a buddy stop over today (John S.) with a beautiful cluster of calcite crystals - dogtooth crystals fluoresce a very pretty off-white, while the matrix calcite a bright orange. Shown under MW and SW.

Originally posted by Mark Cole on Nature's Rainbows in 2017.

Fluorescence under midwave and shortwave UV light.

Normal light.

Summary of luminescence responses:

Calcite (Mindat) (RRUFF)

• Fluorescence under Shortwave (254nm Lamp/Mercury) UV light: Red
• Fluorescence under Midwave (305nm Lamp/Mercury) UV light: White