Polished Petoskey Stone Michigan Hexagonaria Fossil Coral Large 4 Inch Display Specimen

This polished Petoskey stone is a large Michigan fossil coral specimen with sharply defined honeycomb cells and visible central eyes across much of the display face.

At approximately 4 inches long and 1 pound 2 ounces, it has substantial hand sized scale for a Michigan rock collection, fossil display, desk, cabinet, or natural history shelf.

Details

• Item: Polished Petoskey stone fossil specimen
• Item Type: Polished fossil coral display stone
• Era: Devonian fossil material. Date of polishing or preparation not confirmed from photos.
• Materials: Fossilized colonial coral stone
• Color: Taupe, warm gray, cream, brown, and deep charcoal brown
• Maker and Mark: No visible maker's mark.
• Pattern or Model: Natural Petoskey stone honeycomb coral pattern. Hexagonaria fossil structure.
• Style: Polished natural history and Michigan geological display specimen
• Dimensions: Oblong form measuring approximately 4 inches along the long dimension and about 4 inches tall as provided. Product weight 1 pound 2 ounces.
• Special Features: Highly defined honeycomb pattern across the primary face with numerous distinct coral cells and darker centers. Smooth polished surface. Shipping weight 2 pounds.

Condition Grade: Very Good

Positives

• Graded Very Good: The stone is intact and smoothly polished, with a broad area of clearly visible fossil coral structure.
• The primary display face shows strong contrast between the pale cell walls and darker centers.
• Numerous individual coral cells remain sharply readable, including smaller tightly grouped cells toward one end.
• The polished finish reflects light evenly and gives the fossil structure strong visibility.
• The substantial 1 pound 2 ounce weight gives the piece presence as a freestanding geological specimen.

Issues / Wear

• The honeycomb fossil pattern is concentrated most strongly on one face and becomes much darker and less distinct across the reverse and lower portions.
• Natural color variation, inclusions, darker matrix areas, small pits, and irregular fossil boundaries are visible within the stone.
• Fine surface marks may be present within the polished finish.

Condition Grade Key

• Near Fine: Almost perfect. Very minor signs of age only.
• Very Good: Shows light use. Sound and attractive with minor flaws.
• Good: Complete and intact. Noticeable wear consistent with age and use.
• Fair: Shows significant wear. Readable or usable but clearly used.

Collector's Notes

Petoskey stones are fossil colonial corals from Michigan's Devonian rock formations, known for their repeating six sided coral structures.

This size and pattern suit a Michigan stone collector, fossil collector, rockhound, or someone building a Great Lakes natural history display.

The feature worth noticing here is the broad polished face, where dozens of individual cells remain easy to distinguish rather than disappearing into the darker matrix.

It is the kind of Michigan piece that is interesting from across the shelf and even better when you pick it up and start looking at the individual coral cells.

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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