“Fluorescent sodalite-bearing syenite” is a mouthful, but these glowing rocks from the U.P. are also known as Yooperlite. Credit: Courtesy photo The 77th Greater Detroit Gem, Mineral & Fossil Show is ...
In 2017, gem and mineral dealer Erik Rintamaki stumbled upon glowing rocks along a beach near Lake Superior. The rocks, which looked normal at first, fluoresced brilliantly underneath UV ...
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