This unique rock from Lake Superior is a must-have for any mineral specimen or collectible lover. Its bright fluorescence under UV light is sure to amaze and impress. Perfect for display or adding to your collection, this Yooperlite rock is a one-of-a-kind find. Its unique composition of Sodalite and other minerals gives it a striking glow that is sure to draw attention. Don't miss out on the opportunity to own a piece of natural beauty from the Great Lakes region.This is a medium-sized stone. Brilliant, intense, orange glow. I used a 365 nm wavelength UV flashlight for the photos that show the brilliant orange glow, which is required to see the glow.I ship within 24 hours of cleared payment except on Saturdays, Sundays and Holidays.