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Brilliant and unmistakable yellow fluorescing wernerite. These pieces have a purple calcite veining which really only shows under MW, never before reported. Calcite verified through the obvious cleavage and vinegar test. Very interesting pieces.
In our experience, wernerite is always fluorescent bright yellow LW and a dimmer yellow SW. We admit that we can't be sure we've checked pieces with midwave in the past, but with the new MW flashlights we now check everything. Imagine our shock when we saw this piece! The violet area is strongly fluorescent under MW but shows zero response under LW, and a very minimal response under fluorescent tube SW, none under 255nm flashlight (to be expected - tube lights generate a little MW while the LED is pure 255nm SW). These pieces are from the original find. Don't think we've noticed this mineral in later pieces, but it certainly makes sense for collectors to examine their pieces with MW.
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.
