Fun Fact: People living in the upper peninsula of Michigan are often called "Yoopers" due to the Northern accent associated with those in the area. Since this stone was found found on Lake Superior which is one of the lakes surrounding upper peninsula (the northern part) -where the true "Yoopers" are located, and it glows under black light, it was dubbed "Yooperlite" by Erick Rintamaki. The name has stuck ever since!