Sodalite (Hackmanite), Analcime, Polylithionite - Greenland
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Virtually solid bright fluorescent sodalite, quite gemmy with incredibly deep purple tenebrescence. This is one of the more tenebrescent varieties from Greenland. Hackmanite from Greenland displays some of the most dramatic tenebrescence (color change) that we have seen from any place in the world.
Greenland sodalite comes in all colors. This piece is a very bright piece under both SW and LW. Under SW there is a blue fluorescence that is likely analcime. On the second side is some silver polylithionite and possibly even some minor tugtupite. The LW fluorescence is knock-your-socks-off bright.
Tenebrescence is a phenomenon that occurs when certain minerals, in this case hackmanite, are exposed to shortwave UV and these specimens darken to a deep purple in seconds. This deep purple hue will rapidly fade when exposed to a bright white light. This process can be repeated over and over.