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!

Sodalite var. Hackmanite from Greenland - Very Tenebrescent

Contributed by: Mark Cole
Date: Apr 5th, 2026
Locality: Tunulliarfik Fjord, Ilímaussaq complex, Kujalleq, Greenland (See on Mindat)
Size: 3 x 3 x 3 inches
Weight: 15.5 oz

Description:
This is one of the more tenebrescent varieties of sodalite from the Ilimaussaq Complex, Greenland. We discovered it one year in the same area where blue sodalite is found, but these pieces were extracted from a vein within a cliff just prior to the blue sodalite deposit. Perhaps they are blue sodalite "being born?" - their natural color is more of an off-white. But tenebrescence reigns supreme. The green fluorescence is an unknown mineral.

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

Fluorescence under shortwave UV light.
Fluorescence under shortwave 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.

Summary of luminescence responses:

Hackmanite (Mindat) (RRUFF)

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

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