Huron Lightship

Historical marker location:

Port Huron, Michigan

( Marker can be reached from Thomas Edison Parkway, 0.7 miles south of Bluewater Bridge (Interstate 69).)

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.