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Rogerley fluorite is a famous type of fluorite from the Rogerley Mine in County Durham, England. These pieces set the bar for other fluorites on the market, they are simply some of the nicest out there. Under visible light, a nice specimen will contain gemmy emerald green fluorite crystal cubes.
Their fluorescence is so intense and bright, that even when exposed to sunlight, the UV from the sunlight will cause a noticeable color change to blue in the green fluorite crystals. We call this phenomenon, Daylight Fluorescence. It’s very cool to see in person.
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.
