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Tenebrescent hackmanite from Afghanistan. Very unusual fluorescent responses, tenebrescent, phosphorescent. This is piece is slightly tenebrescent, darkening to a light purple in seconds. Unlike Greenland hackmanite, it can take a long time to fade back (time depends on the intensity of the light source).
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.
