@Midtskogen: Perfect skies!
I haven't been up in the mountains for a while, but in the meantime I continue beach combing. Today I found a great example of Carnelian.
Wat can these emissions be detected with a digital camera that has a UV pass filter on it? UV photography is pretty neat- some plants have hidden markings that only pollinators can see (because their eyes are sensitive to near UV light.)It's a thought. I normally only rock hunt during the day since that makes most objects of interest easier to find, but fluorescence is too dim to see in daylight. Also many objects I'm interested in don't fluoresce, like petrified wood. Hunting specifically for fluorescence at night might be interesting, but I'm not sure if my rate of finding things that way would be any better than the rate which I find them already during the day and then testing them back at home. Maybe I'll try it anyway sometime just to see how it goes.