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!

Fantasy Rock from Taseq Slope, Ilímaussaq complex, Narsaq, Kujalleq, Greenland

Contributed by: FMS Admin
minID: UTL-C1F
Date: May 14th, 2026
Locality: Taseq Slope, Ilímaussaq complex, Kujalleq, Greenland (See on Mindat)
Size: 8 x 3.3 x 11.5 cm

Description:
This specimen is one of my favorites in my small Greenland fluorescent minerals collection. It consists of the typical mineral assemblage (tugtupite, chkalovite, sodalite, analcime, natrolite, uranyl salts) nicknamed "fantasy rock" by many fluorescent mineral enthusiasts.

As usual, its most interesting response is under shortwave; but it looks pretty neat under midwave too.
Shown respectively in the gallery below: Shortwave + longwave combined (I shined a convoy-type flashlight on the sodalite for a brief moment during a long exposure photo), midwave, longwave, tenebrescence, natural color, then closeups in the same order.

Originally posted by Frédéric Messier Leroux on Nature's Rainbows in 2021.

Fluorescence under longwave and shortwave UV light.
Fluorescence under longwave and shortwave UV light.
Fluorescence under shortwave UV light.
Fluorescence under shortwave UV light.
Fluorescence under midwave UV light.
Fluorescence under midwave UV light.
Fluorescence under longwave UV light.
Fluorescence under longwave UV light.
Tenebrescence after exposure to shortwave UV light.
Tenebrescence after exposure to shortwave UV light.
Normal light.
Normal light.
Fluorescence under longwave and shortwave UV light. Closeup.
Fluorescence under longwave and shortwave UV light. Closeup.
Fluorescence under shortwave UV light. Closeup
Fluorescence under shortwave UV light. Closeup
Fluorescence under midwave UV light. Closeup.
Fluorescence under midwave UV light. Closeup.
Fluorescence under longwave UV light. Closeup
Fluorescence under longwave UV light. Closeup
Tenebrescence after exposure to shortwave UV light. Closeup.
Tenebrescence after exposure to shortwave UV light. Closeup.
Normal light. Closeup
Normal light. Closeup

Summary of luminescence responses:

Analcime (Mindat) (RRUFF)

  • Fluorescence under Midwave (305nm LED) UV light: Blue
  • Fluorescence under Shortwave (255nm LED) UV light: Blue
Chkalovite (Mindat) (RRUFF)
  • Fluorescence under Shortwave (255nm LED) UV light: Green
Natrolite (Mindat) (RRUFF)
  • Fluorescence under Shortwave (255nm LED) UV light: Green
Sodalite (Mindat) (RRUFF)
  • Fluorescence under Longwave (365nm LED) UV light: Orange
  • Fluorescence under Midwave (305nm LED) UV light: Orange
  • Fluorescence under Shortwave (255nm LED) UV light: Red
Tugtupite (Mindat) (RRUFF)
  • Fluorescence under Longwave (365nm LED) UV light: Orange
  • Fluorescence under Shortwave (255nm LED) UV light: Red

FMDB Home Page
Submit a new specimen!
My Collection