What is considered the state stone of Michigan?

The Petoskey stone is recognized as the state stone of Michigan due to its unique characteristics and cultural significance. This fossilized coral, specifically the hexagonaria, is primarily found in the northern parts of the state, particularly along the shores of Lake Michigan. Its distinct pattern of hexagonal shapes gives it a distinctive appearance, making it popular among collectors and crafters.

The adoption of the Petoskey stone as the state stone in 1965 reflects Michigan's geological heritage, as it represents the rich history of the area that was once underwater during the Devonian period. This choice connects residents and visitors alike to the state's natural history and encourages an appreciation for Michigan's distinct geological features. The other options, while notable in their own right, do not hold the same status or recognition as symbols of Michigan’s identity and geological history.