Mimetite - Mapimi, Mexico

Contributed by: Mark Cole
Date: Apr 1st, 2026
Locality: Mapimí, Mapimí Municipality, Durango, Mexico (See on Mindat)

Description:
Added Note:There are two fluorescent minerals in this specimen. The original post does not identify which mineral is mimetite. Mimetite from Mapimi commonly has a botryoidal habit and the yellow botryoidal crystals in this specimen that fluoresce pale yellow are likely the mimetite. The pale green fluorescent mineral is unknown.

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

Fluorescence under shortwave UV light.

Normal light.

Summary of luminescence responses:

Mimetite (Mindat) (RRUFF)

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