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A very bright piece of sodalite under all wavelengths! The fluorescence is knock-your-socks-off bright. The rock that put Greenland on the map. In spite of tugtupite being best known, this rock is the reason we visited Greenland in 2002. One boulder was found of this material (and reduced to rubble after a couple of years and visits by subsequent geo-tours we organized). We were never able to find another source.
Greenland sodalite comes in all colors. This piece is nice green sodalite in a lujavrite matrix. The patterning is very attractive and it's a very bright piece under both shortwave UV and longwave UV. This material is also nicely tenebrescent. The animation/GIF below shows the color change after exposure to shortwave UV. This color is faded upon exposure to bright light and the change can be repeated over and over.
365nm UV light is often called "blacklight". Before the advent of longwave UV LEDs, blacklight fluorescent tubes, (the kinds used in hippie days to light up psychedelic posters) were the standard longwave UV light for our hobby. They were not very powerful but they did light a large area.
Enter 365nm UV LEDs
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.
