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The blue sodalite on this piece changes color when exposed to UV (SW), darkening to a light purple - a unique hue compared to other Greenland sodalites due to the natural blue coloring. Under SW it starts out orange but quickly shifts to a rusty color due to the tenebrescence (see animation below to view the tenebrescent change).
Bright green fluorescent areas are uranyl activated, unusual in that they occur mostly at the edges where the minerals intersect.
The natural color is a beautiful blue - one of the only blue sodalites which is strongly fluorescent, not to mention slightly tenebrescent.
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.
