(365nm flashlight included) This 6lb 7oz Yooperlite is a type of fluorescent sodalite with a unique graffiti style pattern. This mineral, found on the shores of Lake Superior, is known for its bright and vivid colors under ultraviolet light. It is a popular collectible among enthusiasts of fluorescent minerals and crystals. The Yooperlite's distinctive appearance and origins make it a sought-after item for collectors and hobbyists alike.