Check the listing for details. Yooperlite Bat 91.67g. Condition: Used. Listed at 10.50 USD. The Yooperlite Bat 91.67g is a unique and fascinating collectible item that belongs to the category of Fluorescent Minerals. This piece is a rare Yooperlite stone, known for its exceptional illuminate qualities when exposed to ultraviolet light. With a weight of 91.67g, this Yooperlite Bat is sure to be a standout addition to any crystal and mineral specimen collection. Its striking appearance and distinctive characteristics make it a sought-after item for collectors and enthusiasts alike.