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A large, gemmy cleavage rhomb of “terlingua-type” transparent pink calcite from Challenger Cave, Nuevo Leon, Mexico. The famous Challenger cave is a series of caverns that have been a source for these clear calcite rhombs.
Very bright and reactive to all UV wavelengths – pink under longwave, peach/white under midwave and bright blue/violet under shortwave.
There is also a nice long-lasting phosphorescence under shortwave UV, a big shorter under longwave. You don’t see longwave phosphorescence very often.
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.
