Frank E. Warner

Historical marker location:

903 S Bailey Ave, South Haven, Michigan

( Marker can be reached from Bailey Avenue (State Highway 43) 0.2 miles north of Aylworth Avenue, on the right when traveling north.)

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.