Best & Easiest Hunting
Yooperlite
Yooperlite is a coarse-grained igneous rock containing fluorescent sodalite. It can be found along the shores of the Great Lakes, especially Lake Superior, and in Michigan's Upper Peninsula. It is very hard to find. During the day, Yooperlite looks like any other beach rock. They can be found at night, using an ultra-violet light.