This shape of Michigan’s Upper Peninsula is made from Lake Superior Fluorescent Sodalite, also known as Emberlite, Yooperlite, and Lake Superior Glow Rock. Though these types of rocks are polished to a beautiful shine and look great in regular light, they are the stars of the show when put under a 365nm UV black flashlight (sold separately). They look like glowing embers in a fire. No wonder these rocks are in such demand! Consider adding 365nm UV Flashlight and a sterling silver chain with this item.