St. John's Church

Historical marker location:

717 N Francis St, Jackson, Michigan

( Marker is at the intersection of North Francis Street and East Ganson Street, on the left when traveling south on North Francis Street.)

Marker installed: 1979

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.