Yooperlite rocks are actually Syenite rocks that are rich in fluorescent Sodalite. These rocks were recently discovered by Erik Rintamaki in 2017.

In 2017, Erik went out on a beach in Lake Superior with a UV light and discovered dozens of these glowing rocks. To the naked eye, they look like ordinary gray rocks, but under the UV light, the mineral composite makes the rocks glow a vibrant orange and yellow!

The glowing from these Yooperlite’s lasts for 12+ hours after 8 minutes of UV (sunlight or UV light) charge. These should never be used in concentrated, water-based applications like aquariums.