Yooperlite is actually a form of syenite rock which is rich in fluorescent sodalite. This stone was found in Michigan, USA in 2017 and "glows" under a UV light.
The pictures with the orange areas were taken with the a small UV flashlight pointed towards the pieces. You can see the fluorescent sodalite appears orange under the UV light.
![My Pretty Pony – Stephen King, Barbara Kruger [1st Ed.]](https://www.bagallure.shop/image/my-pretty-pony-stephen-king-barbara-kruger-1st-ed_huynOh_300x.webp "My Pretty Pony – Stephen King, Barbara Kruger [1st Ed.]")
