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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.
First, an animation showing the difference between the UV flashlight we recommend (365nm filtered UV flashlight) versus unfiltered 395nm UV flashlights we see many folks carrying around at shows. So. much. visible purple light. We selected a bunch of rocks as a demonstration. Took pictures of them under his flashlight without the filter and then with the filter.
A major component of rock collecting (for us) is simply getting out in nature. A buddy dragged us out to a very remote area here in middle Tennessee to hunt for fluorescent green agate. Since we consider ourselves pure "Glow Hounds" we weren't anticipating any glow rocks, just the beauty of the area, but we brought our UV lights anyway.
