11 Fluorescent Sodalite yooperlites totaling 2lb 7oz . These yooperlites have beautiful patterns and really light up well under 356nm uv light. The uv Images are front and back. The main image in natural light is wet to show the nice color. None of the uv images are wet. The official name for these glow rocks is Fluorescent Sodalite in Syenite. It glows with a 365nm UV flashlight. The images were taken with a convoy S2 365nm UV flashlight. Use a similar light to reveal the golden orange fluorescent sodalite. These beach rocks are from the great lakes shorelines. Great Lakes Glow!