Hackmanite from Narsaq, Illmaussaq complex, Greenland
Contributed by: FMS Admin
minID: VEU-F0D
Date: May 14th, 2026
Locality: Ilímaussaq complex, Kujalleq, Greenland (See on Mindat)
Size: 5.1 x 5 x 5.1 cm
Description:
Shown in this post is a modest-sized, but nice specimen of hackmanite from Narsaq, Illmaussaq complex, Greenland. It is associated with natrolite (green under shortwave & midwave UV, and very weak green under longwave UV), non-fluorescent aegirine, and some SW and MW white fluorescing and phosphorescent unknown mineral.
The hackmanite is very nicely tenebrescent upon exposure to both SW and MW, and also moderately LW (unlike some LW tenebrescent hackmanite, it doesn't change color when left in the sun).
Originally posted by Frédéric Messier Leroux on Nature's Rainbows in 2021
Summary of luminescence responses:
Hackmanite (Mindat) (RRUFF)
- Fluorescence under Longwave (365nm LED) UV light: Orange
- Fluorescence under Midwave (305nm LED) UV light: Orange
- Fluorescence under Shortwave (255nm LED) UV light: Red
- Tenebrescence after exposure to Shortwave (255nm LED) UV light: Purple
- Afterglow after exposure to Shortwave (255nm LED) UV light: White
- Fluorescence under Midwave (305nm LED) UV light: Green
- Fluorescence under Shortwave (255nm LED) UV light: Green