Fluorescent Mineral Database

A new secret project! Trying to create a nice Fluorescent Mineral Database (FMDB), which would be searchable by mineral, locality, and luminescence properties. Also making it easy for people to contribute with their own specimens!

Fluorite Crystals on Calcite - Superb Bi-Color Under Longwave

Contributed by: Mark Cole
Date: Apr 13th, 2026
Locality: El Hammam Mine, El Hammam, Ait Mimoune Caïdat, Khémisset Cercle, Khémisset Province, Rabat-Salé-Kénitra Region, Morocco (See on Mindat)
Size: 3.5 x 2 x 3.5 inches
Weight: 15.9 oz

Description:
It is rare to find two-color fluorescence under longwave UV only. This specimen from El Hammam Mine in Morocco, illuminated under 365nm LW LEDs, has beautiful saturated blue fluorite cubes resting on an exceptionally bright calcite matrix. This piece truly displays best under LW - the SW fluorescence is weaker, especially for the calcite.

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

Fluorescence under longwave UV light.
Fluorescence under longwave UV light.
Fluorescence under shortwave UV light.
Fluorescence under shortwave UV light.
Normal light.
Normal light.

Summary of luminescence responses:

Calcite (Mindat) (RRUFF)

  • Fluorescence under Longwave (365nm LED) UV light: Red
  • Fluorescence under Shortwave (254nm Lamp/Mercury) UV light: Red
Fluorite (Mindat) (RRUFF)
  • Fluorescence under Longwave (365nm LED) UV light: Blue
  • Fluorescence under Shortwave (254nm Lamp/Mercury) UV light: Blue

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