This Michigan Petoskey Stone is a polished 1 lb. 10 oz. fossil coral specimen measuring approximately 4 inches long, with clearly visible Hexagonaria coral patterns across its surface.
The substantial hand sized form, brown and olive gray coloring, dark centered coral cells, and glossy polished finish make it especially suited to a Michigan collection, rock and fossil cabinet, bookshelf, desk, or mantel display.
Details
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Item: Polished Petoskey Stone
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Item Type: Fossil coral display specimen
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Era: Devonian fossil material, approximately 350 million years old
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Materials: Fossilized Hexagonaria coral stone
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Color: Brown, olive brown, gray, cream, and dark brown
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Maker and Mark: Natural specimen. No maker's mark
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Pattern or Model: Hexagonaria percarinata coral pattern
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Style: Polished natural history and lapidary display specimen
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Dimensions: Approximately 4 inches long, 3 inches wide, and 2 inches tall
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Special Features: Weight 1 lb. 10 oz. Polished rounded form with repeating fossil coral cells, dark centers, radiating internal structure, and glossy surface finish
Condition Grade: Very Good
Positives
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Graded Very Good: The specimen is solid, fully polished, and presents clearly as a substantial display piece.
- The polished surface has a strong gloss that makes the fossil pattern easy to see across multiple sides.
- Numerous coral cells remain clearly defined, including darker centers and fine radiating structures.
- The large 1 lb. 10 oz. size gives the stone considerably more presence than the small beach pebble examples commonly encountered.
Issues / Wear
- Natural lines, small pits, color changes, and irregular areas are visible within the fossil material.
- There are scattered small surface imperfections within the polished stone. These appear consistent with the natural fossil material rather than later damage.
Condition Grade Key
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Near Fine: Almost perfect. Very minor signs of age only.
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Very Good: Shows light use. Sound and attractive with minor flaws.
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Good: Complete and intact. Noticeable wear consistent with age and use.
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Fair: Shows significant wear. Readable or usable but clearly used.
Collector's Notes
Petoskey Stones are fossil remains of colonial coral from Michigan's Devonian rock formations. Michigan named the Petoskey Stone its official state stone in 1965.
Its Michigan connection makes this form especially relevant to fossil collectors, Great Lakes rockhounds, and buyers looking for a piece tied closely to the state's natural history.
This specimen weighs 1 lb. 10 oz. and shows the coral structure across a broad polished surface, giving the pattern room to be seen without magnification.
It is the kind of Michigan piece that works just as well on a bookshelf or mantel as it does in a fossil cabinet.
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Disclaimer
All items are vintage and may show signs of age, wear, or use consistent with their history. Photos show the exact condition of each piece, please review them carefully, as they are part of the description.
I do my best to capture colors accurately, but your monitor or device screen may display colors slightly differently from the actual item.
Please Note:
These pieces come from estate collections and have been surface cleaned. You may wish to perform additional cleaning depending on your preference.
How Reading Vintage sources and grades every piece
