Fluorescent Mineral Database

"Fantasy Rock" - Tugtupite, Sodalite, Analcime, Chkalovite

Contributed by: Mark Cole
Date: Mar 12th, 2026
Locality: Taseq Slope, Ilímaussaq complex, Kujalleq, Greenland (See on Mindat)
Size: 3.5 x 2.5 x 4 inches
Weight: 17.6 oz

Description:
The nickname "Fantasy Rock" encompasses a group of rocks found on the Taseq Slope in the Ilimaussaq Complex, Greenland and only in this one locality within the complex. A typical Fantasy Rock usually consists of four basic minerals: tugtupite, sodalite, chkalovite, and analcime and they are always the most color-rich pieces from this exotic, remote locale.

The sodalite in these rocks is almost always very tenebrescent.

Originally posted by Mark Cole on Nature's Rainbows.

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:

Analcime (Mindat) (RRUFF)

  • Fluorescence under Shortwave (254nm Lamp/Mercury) UV light: Blue
Chkalovite (Mindat) (RRUFF)
  • Fluorescence under Shortwave (254nm Lamp/Mercury) UV light: Green
Sodalite (Mindat) (RRUFF)
  • Fluorescence under Longwave (365nm LED) UV light: Yellow
  • Fluorescence under Shortwave (254nm Lamp/Mercury) UV light: Orange
  • Tenebrescence after exposure to Shortwave (254nm Lamp/Mercury) UV light: Purple
Tugtupite (Mindat) (RRUFF)
  • Fluorescence under Longwave (365nm LED) UV light: Yellow
  • Fluorescence under Shortwave (254nm Lamp/Mercury) UV light: Red
Hyalite (Mindat) (RRUFF)
  • Fluorescence under Shortwave (254nm Lamp/Mercury) UV light: Green