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This bright green opal specimen consists of transparent, bubbly hyalite opal covering a matrix. The hyalite opal shows a bright green fluorescent response under both shortwave and longwave UV.
Trace amounts of uranyl are the reason for this bright green glow.
This specimen also displays "daylight fluorescence". Under indirect sunlight with the best results on a cloudy day, you’ll see a green fluorescence without the use of any UV lights (excluding the UV light from the sun).
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.
