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Tugtupite vein

Tugtupite - A Rare Fluorescent Mineral from Greenland

Tugtupite is the most widely known fluorescent mineral from Greeenland. It is used in making beautiful tugtupite cabochons. 
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Ilimaussaq Complex, Greenland

The Fluorescent Minerals of Greenland

The Ilímaussaq complex is one of the world's most fascinating igneous complexes with an abundance of rare elements.
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What is Tenebrescence? (All about Hackmanite - Hint: it's not fluorescence)

What is Tenebrescence? (All about Hackmanite - Hint: it's not fluorescence)

Minerals which are capable of this reversible color change by exposure to UV (or other energy sources), without any change in their essential composition, are said to be tenebrescent
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Tenebrescent Tugtupite

Tenebrescence Experiments, Theories, Questions, and even some Facts

Recently I posted a question about Afghan sodalite (hackmanite) after reviewing the MinRec article about Sar-E-Sang. Someone reminded me that there was a large discussion on this topic last year. I dug out that discussion and copied it here to the blog. This is one reason we created Nature's Rainbows - to capture these excellent discussions. 
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Greenland Sodalite Hackmanite - Quick Change Artist, Tenebrescent Champion

Greenland Sodalite Hackmanite - Quick Change Artist, Tenebrescent Champion

Tenebrescence of Greenland sodalite is amazing. This is a piece of a deeply tenebrescent sodalite.
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Sodalite Hackmanite and Tugtupite Tenebrescent

Video of Tenebrescent Sodalite (Hackmanite) and Tugtupite

Tenebrescence is when minerals change color when exposed to sunlight, also known as reversible photochromism.
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