Tugtupite and Polylithionite - Greenland

Contributed by: Mark Cole
Date: Mar 12th, 2026
Locality: Kangerluarsuk Fjord, Ilímaussaq complex, Kujalleq, Greenland (See on Mindat)
Size: 3 x 2 x 4 inches
Weight: 15.3 oz

Description:
A beautiful pinkish fluorescing tugtupite with a vein of delicate polylithionite crystals. The tugtupite is nicely tenebrescent - both minerals are very bright under shortwave. Under longwave the tugtupite fluoresces a bright salmon color. Green fluorescence is uranyl activated.

Originally posted by Mark Cole on Nature's Rainbows.

Fluorescence under shortwave UV light.

Normal light showing tenebrescence.

Fluorescence under shortwave UV light. Closeup

Summary of luminescence responses:

Polylithionite (Mindat) (RRUFF)

• Fluorescence under Shortwave (254nm Lamp/Mercury) UV light: Yellow

• Fluorescence under Shortwave (254nm Lamp/Mercury) UV light: Red