St. Joseph's Parish

Historical marker location:

1828 Jay St, Detroit, Michigan

( Marker is at the intersection of Orleans Street and Jay Street, on the right when traveling north on Orleans Street.)

Marker installed: 1973

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.