This listing is for the Yooperlite shown in the photos.  Yooperlites are a syenite rock with fluorescent sodalite and are found on the shores of Lake Superior.  The photos show the stones from two angles in regular light and UV light from a 365nm uv flashlight.  365 nm UV light is recommended for these stones as others will not make it glow as bright.  The total weight of this stone is 2 lb 6.9 oz and it measures approximately 4 1/2" x 4" x 2 1/4".

Please feel free to send a message if you have any questions!