What makes “Yooperlite” rocks glow under UV light?
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When hit with UV light rays, the sodalite found in Yooperlite glows.
Sodalite lights up when so-called activator elements inside them are excited by high-energy UV light. The atoms in that fluorescent mineral absorb some of that energy, but release the rest as lower-energy visible light, hence why the mineral appears to glow.
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