Petoskey Stones Are Amazing Coral Fossils and Here’s How to Find One

A beautifully polished Petoskey stone from Emmet County, Michigan. Image credit: The Children’s Museum of Indianapolis
The Petoskey stone is not very noticeable when dry, as it looks like ordinary limestone. However, when wet or polished, it reveals its stunning mottled pattern. The Petoskey stone can be made into decorative objects, jewelry, or even used as a gemstone. It is also the state stone of Michigan since 1965.