Historical Marker
The Copper Country
Historical marker location:
Copper Harbor, Michigan
( Marker is on Brockway Mountain Drive, 4 miles west of Gratiot Street (State Highway 26), on the right when traveling west.)
Marker installed: 2008
Michigan is the only state to have two designated "state stones": the Petoskey Stone, which is the state stone of Michigan, and the Isle Royale Greenstone, which is the state gemstone of Michigan. The Petoskey Stone is a fossilized coral that is found primarily in the northern Lower Peninsula, while the Isle Royale Greenstone is a rare mineral found only on Isle Royale in Lake Superior.