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A great piece of sodalite (hackmanite) with bright red-orange fluorescence under shortwave.
The material from this locality is probably the winner in the color-change department. We don't have much of this deeply tenebrescent material left.
Upon exposure to SW UV the sodalite on this piece changes color to a deep purple - in seconds! Expose it to a bright white light (UV free halogen or LED spotlight held directly on the rock) and it reverts back to its natural color almost immediately. The LW fluorescence is knock-your-socks-off bright.
The animation shows the color change (tenebrescence) after exposure to longwave and shortwave UV.
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.
