The Great Lakes, the largest freshwater system in the world, are home to a diverse geological makeup spanning hundreds of millions of years. While many head to the planet's largest freshwater body of ...

Add Yahoo as a preferred source to see more of our stories on Google. Most people do their rock hunting during the day, but you can't find "Yooperlites" until the sun goes down. Yooperlites are rocks ...

Yooperlites are rocks that fluoresce under UV light. The best time to search for Yooperlites is after a storm, when waves may have unearthed new rocks along the shores of Lake Superior. Rock hunters ...

Erik Rintamaki, 43, of Brimley, considers himself an amateur rock hound who's been on a wild ride, all because of some beautiful fluorescent specimens. Rintamaki said he was out on a Lake Superior ...

Add Yahoo as a preferred source to see more of our stories on Google. Named for the state's Upper Peninsula (whose residents are known as "Yoopers"), these seemingly nondescript gray stones glow ...