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Product Description
Petoskey Stone Slab Unpolished Rough Rock Fossil Michigan
This unpolished natural Petoskey Stone stone slab is 3 inches by 1.5 inches and 8 mm or about 1/3 inch thick.
It weighs about 50 grams and is shown wet in the first 2 pictures.
"Mich" is written on one side.
Petosky Stones are fossil coral from Michigan.
Petosky Stone can be found along the beaches of Lake Michigan and Lake Huron, as well as in rock quarries from Alpena to Traverse City, Michigan. The species is Hexagonaria percarinata, a type of rugose coral that lived in warm shallow seas during the Middle Devonian period about 350 million years ago.
Petosky Stones are often worn and rounded by the waves on the beach, and when cut have a beautiful pattern of the six-sided, star-like coral inside.
Petoskey Stones were declared the official state stone of Michigan in 1965.
