Yellow Sodalite in Nepheline Syenite, Very Tenebrescent (Hackmanite) - Greenland

Contributed by: Mark Cole
Date: Apr 2nd, 2026
Locality: Ilímaussaq complex, Kujalleq, Greenland (See on Mindat)

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

Fluorescence under longwave UV light.

Fluorescence under shortwave UV light.

Tenebrescence after exposure to shortwave UV light.

Normal light.

Tenebrescence after exposure to shortwave UV light. Closeup.

Normal light. Specimen size image compared to a US dollar bill.

Summary of luminescence responses:

Sodalite (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