Maybe that's why I was so often disappointed when trying to get fluorite to fluoresce when I was into minerals as a kid. I always used UVA. I just assumed the blue I was supposed to see from fluorite was the same color as the UVA reflection, but I felt it should be more noticeable. I might go try it with UVC.
EDIT, maybe my UVC light is broken? I saw absolutely nothing out of 2/3 of my mineral collection (which is up for trade for a cool laser) with the UVC. I'm still on the fence about the fluorite with UVA, but saw a lot of action out of my other minerals with it. I have never seen a mineral charge up and hold a glow for a while. I've lost a few of my good fluorescent minerals, but I don't remember any giving off much light for any length of time after turning off the UVA. :can::scowl: