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Rare hyalite opal fluorescent under all wavelengths. Under white light, this specimen features colorless transparent, glassy bubbles of hyalite opal. Under UV light, this specimen glows bright green under shortwave, midwave and longwave. Trace amounts of uranyl are the reason for this bright green glow.
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). This is what we call “daylight fluorescence”.
The Garpenberg mine is located in Bergslagen, a very old mining area in the southern part of Sweden.
The mine is very active today and is one of Europe's most progressive underground mining operations. Collecting is not possible, and the few specimens that reach collector's hands are highly prized. The mineralogy is quite similar to that of Franklin NJ.
