Tenebrescent Yellow Sodalite - Greenland

Contributed by: FMS Admin
minID: 5YF-613
Date: May 12th, 2026
Locality: Taseq Slope, Ilímaussaq complex, Kujalleq, Greenland (See on Mindat)
Size: 2.4 x 2 x 4.1 cm

Description:
Shown here is a very modest sized but lovely specimen of tenebrescent yellow sodalite, from Taseq Slope East, Ilímaussaq complex, Narsaq, Kujalleq, Greenland.

In the first picture, it is fluorescing under shortwave UV; then in the next pictures, the very bright orange longwave UV response, the tenebrescence and the natural color of the sodalite after "bleaching" the tenebrescence with a bright white LED light are shown.

Originally posted by Frédéric Messier Leroux on Nature's Rainbows in 2022.

Fluorescence under shortwave UV light.

Fluorescence under longwave UV light.

Tenebrescence after exposure to shortwave UV light.

Normal light.

Fluorescence under shortwave UV light. Side 2

Fluorescence under longwave UV light. Side 2.

Tenebrescence after exposure to shortwave UV light. Side 2.

Normal light. Side 2.

Summary of luminescence responses:

Sodalite (Mindat) (RRUFF)

• Fluorescence under Longwave (365nm LED) UV light: Orange
• Fluorescence under Shortwave (255nm LED) UV light: Red
• Tenebrescence after exposure to Shortwave (255nm LED) UV light: Purple