Alpine Township Hall

Historical marker location:

2408 7 Mile Rd NW, Comstock Park, Michigan

( Marker is at the intersection of 7 Mile Road Northwest and Walker Avenue Northwest, on the right when traveling east on 7 Mile Road Northwest.)

Marker installed: 1990

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.