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Blue plumbogummite and olive green pyromorphite. These pieces are found in a hydrothermal lead-zinc deposit, hosted in limestone and sandstone with granite intrusions. Two mines operate in the area and there might be some confusion about the exact mine - the Daoping and Yangshuo mines, connected underground.
Plumbogummite is a rare secondary lead phosphate mineral coating bright yellow-green pyromorphite crystals. Exceptional color under midwave (MW) UV, duller under shortwave, with no response longwave. This is one of the few fluorescent mineral specimens that is absolutely best under midwave. Add some shortwave if you like for added pzazz in the green areas. These pieces are VERY selective. Some don’t fluoresce at all.
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.
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.
