PICTURES: Check out these whopping 'Yooperlites' Rintamaki says it all started in 2017 when he went out on a beach in Lake ... rocks, but under the UV light, the mineral composite makes the rocks ...

Yooperlites are a variety of sodalite-rich syenite found in the Upper Peninsula of Michigan.

"Because when you shine it at night on all the rocks, some of them glow red like embers in a fire ... But what Wenner is onto along the North Shore of Lake Superior is different.