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!

Gem Sodalite var. Hackmanite, Prehnite - Greenland

Contributed by: Mark Cole
Date: Apr 8th, 2026
Locality: Tunulliarfik Fjord, Ilímaussaq complex, Kujalleq, Greenland (See on Mindat)
Size: 4 x 2 x 5 inches
Weight: 2.1 lb

Description:
Let\'s face it - most rocks from Greenland are butt-ugly. Sure, gem tugtupite is pretty, along with the occasional crystal find (sorensenite, etc) but most of them have been squeezed, squozed, metamorphosized, and generally abused by mother nature - UNTIL you put them under the light.

This is a piece of material - sodalite var. hackmanite with a beautiful gem translucent mineral we think might be prehnite. I find it almost as striking under white light as under UV. There is also an unknown dim fluorescent white mineral at the bottom. Strong tenebrescence, striking LW, and very gemmy. The closeup picture shows the beautiful translucent green areas under white light.

Originally posted by Mark Cole on Nature's Rainbows in 2018.

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

Summary of luminescence responses:

Hackmanite (Mindat) (RRUFF)

  • Fluorescence under Longwave (365nm LED) UV light: Orange
  • Fluorescence under Midwave (305nm Lamp/Mercury) UV light: Red
  • Fluorescence under Shortwave (254nm Lamp/Mercury) UV light: Red
  • Tenebrescence after exposure to Shortwave (254nm Lamp/Mercury) UV light: Purple

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