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This fluorescence is caused by trace amounts of uranyl ions incorporated into the silica structure during its formation
has produced some of the world's finest specimens of fluorite
Smoky quartz is a variety of quartz that gets its characteristic smoky brown to black color from natural irradiation and the presence of aluminum impurities
The Elmwood Mine
is a colorful mineral composed of calcium fluoride (CaF
Malachite Egg #9 Electric Wonderland This fluorescence is caused by
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