Historical Marker
Ford's Model T
Historical marker location:
461 Piquette Ave, Detroit, Michigan
( Marker is at the intersection of Piquette Avenue and Beaubien Boulevard, on the right when traveling east on Piquette Avenue.)
The Secret on the Third Floor.
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.