Here's why these extraordinary rocks glow under UV light.
Erik Rintamaki
Last year, gem dealer Erik Rintamaki discovered rocks on the beaches of Lake Superior that seemed to glow as though they were molten. Researchers from Michigan Tech University and the University of Saskatchewan managed to figure out why they fluoresce.Gem and mineral dealer Erik Rintamaki was on the beaches of Lake Superior, between Whitefish Point and Grand Marais, when he made a curious discovery.
He stumbled across some rocks that seemed to be glowing, emitting a potent glow when exposed to ultraviolet light — they seemed to be partially molten. Rintamaki dubbed them"yooperlites", a nod to locals from Upper Michigan who are often referred to as Yoopers.Researchers from Michigan Tech University and the University of Saskatchewan examined and analysed the rocks to try and understand what they were made of and where they came from.
Syenite is an intrusive magmatic rock, formed by the slow cooling of a magma deep below the earth's surface. It's crystals can expand to span a few millimeters, sometimes centimetres. While it belongs to the same family as granites, it appears much darker due to a higher content of certain minerals, including pyroxenes and amphiboles.To the naked eye, the rock — composed of oxygen, silicon, chlorine, sodium and aluminium — is blue-grey with white streaks.
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