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A nicely tenebrescent sodalite (hackmanite) sphere. This sodalite is bright under all wavelengths, midwave, shortwave and longwave with a nice tenebrescence under both shortwave and longwave.
The sodalite area displays some interesting phosphorescence – we don’t usually see this in Greenland sodalite. Very unique stuff. You won’t find many Greenland sodalite spheres such as this one on the market.
Blue can likely be analcime. Black arfvedsonite crystals with a fluorescent uranyl green coating makes for a nice contrast.
What is tenebrescence? This is the process when the sodalite on this piece changes color after exposure to UV (shortwave or longwave), darkening to a purple as shown in the GIF - a unique hue compared to other Greenland sodalites. Under longwave the bright orange fluorescence is unmistakable.
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.
