A Petoskey stone is a rock – and a fossil – composed of a fossilized rugose coral. Petoskey Stones are fragments of a coral reef that was originally deposited during the Devonian period.
In 1965, the Petoskey Stone was named the state stone of Michigan.
How Were Petoskey Stones Formed?
Petoskey Stones were formed as a result of glaciation. Sheets of ice would pull stones from the bedrock, grind off the stone’s rough edges and deposit them mainly in the northwestern area of Michigan’s lower peninsula.
When dry, the stone resembles ordinary limestone. If you get a Petoskey stone wet or polish it using lapidary techniques, the distinctive pattern of the six-sided coral fossil emerges. Artists use polished Petoskey stones in jewelry and decorative pieces. A polished stone is also just fun to have and admire.
Visit Sturgeon River Pottery for jewelry and gifts made from beautiful Petoskey stones.