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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.
They were nicknamed "Yooperlites" which is derived from the name “yooper”. A yooper is a nickname for the Upper Peninsula natives and these fluorescent stones quickly gained fame. After data was published on these fluorescent stones, it was discovered that sodalite is the actual true mineral that is fluorescing orange.
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.
