Historical Marker
South Haven Lighthouse
Historical marker location:
10 Water Street, South Haven, Michigan
( Marker can be reached from Water Street, 0.1 miles west of St. Joseph Street, on the right when traveling west.)
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.