Tugtupite, Chkalovite and Analcime - Taseq Slope, Ilímaussaq Complex, Kujalleq, Greenland

Contributed by: FMS Admin
minID: C50-QL4
Date: May 16th, 2026
Locality: Taseq Slope, Ilímaussaq complex, Kujalleq, Greenland (See on Mindat)
Size: 5.9 x 5.1 x 8 cm

Description:
Really nice small cabinet specimen of tugtupite (bright cherry red SW), chkalovite (pearl-white and blueish-white SW) and analcime (blue), with areas of bright uranyl-activated green fluorescence. This recently acquired specimen is currently my favorite among my Greenlandic fluorescent minerals; I really like how well balanced the colors are.

Shown in the images below: shortwave UV fluorescence, then midwave and longwave UV fluorescence, visible light, then closeup pictures of the specimen in the same sequence.

Under midwave, the color of the tenebrescent solid tugtupite grains shifts to a pinkish red color; and the tugtupite that occurs as thin replacement rims around chkalovite fluoresces orange. The response of the chkalovite shifts to a yellowish white color. As usual, longwave is the least colorful but still bright and showy in this case.

Originally posted by Frédéric Messier Leroux on Nature's Rainbows in 2021.