Recently I dug some phosphorescent fluorite crystals, I don’t have a good UV source except for a cheapo LED lamp I bought from China, but I decided to give this a try. There was enough UV that some of the crystals did phosphoresce a blue/greenish color. I’ve never checked out any of my crystals this way so it was awesome to see the illumination continue for well over a minute. I wonder what a more powerful lamp would do?
I am still experimenting with what quality of the stones allows the phosphorescence. At first I thought that only the more gemmy of the crystals I found phosphoresce, but that isn’t true. Some of the most gemmy crystals do not phosphoresce at all!