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Product Description
Petoskey Stone Polished Rock Fossil Michigan
This slabbed and polished on one face natural Petoskey Stone stone is 2.7 inches by 2.12 inches and .65 of an inch at its thickest.
When we got it it had a resin covering-we ground that off and polished it, but there is still some resin visible on the back.
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.
