Michigan's official state stone is really calcified coral that thrived when the Upper Midwest was part of a shallow inland sea. The coral's name was Hexagonaria, and ancient silts and muds bestow its muted colors. It has a hardness of 4 to 5. These pieces all have a high polish and are wonderful examples of Petoskey. I have tried to show in the photos the color variations from stone to stone.animal fossil, fossilized coral, fossil coral, Michigan State Stone,
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