Tugtupite

Tugtupite is a rare beryllium-bearing feldspathoid mineral with a distinctive pink-to-red color, found chiefly in alkaline igneous rocks.

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Feldspathoid: A silica-poor tectosilicate mineral that commonly occurs in alkaline igneous rocks. Tugtupite belongs to this mineral group and forms where silica is scarce.
Tenebrescence: A reversible change in color caused by exposure to ultraviolet or other energetic light. Some tugtupite specimens change color after irradiation and fade when kept in darkness.
Ilímaussaq complex: A large alkaline igneous complex in southern Greenland, renowned for rare minerals. Tugtupite was first identified in this complex, which remains its type locality.
Tugtupite from Greenland: Tugtupite specimens from the mineral’s best-known occurrences in southern Greenland. Greenland material established the mineral’s reputation for vivid color and luminescence.
Tugtupite crystal structure: The arrangement of atoms in tugtupite’s crystalline framework. Its framework structure helps distinguish tugtupite from chemically related feldspathoids.
Photoluminescence: Light emission from a material after it absorbs photons. Tugtupite can emit visible light under ultraviolet excitation.
Narsaq: A town in southern Greenland near the Ilímaussaq alkaline complex. The nearby Tugtup agtakôrfia locality supplied the mineral’s name.
Mont Saint-Hilaire: A rare-mineral locality in Quebec, Canada, known for its alkaline intrusive rocks. Tugtupite is reported from this locality outside its principal Greenland occurrence.
Beryllium: A lightweight alkaline-earth element with atomic number 4. Beryllium is an essential constituent of tugtupite’s chemical composition.
Fluorescence: Light emission that stops almost immediately after the exciting radiation is removed. Many tugtupite specimens fluoresce, adding to their appeal as collector minerals.