Petoskey Stone Michigan Fossil Coral Hexagonaria Partially Polished 2 Inch Specimen

This Petoskey Stone is a partially polished fossil coral specimen showing the distinctive clustered corallites associated with Hexagonaria, with dark centers and fine radiating lines visible across the polished face.

The contrast between the glossy patterned surface and the naturally rough reverse makes this approximately 2 inch specimen especially useful for a rock, fossil, Michigan, or Great Lakes collection because both the revealed pattern and the untreated stone can be examined.

Details

• Item: Petoskey Stone fossil specimen
• Item Type: Fossil coral stone
• Era: Middle Devonian geological period
• Materials: Fossilized coral stone
• Color: Brown, dark brown, gray, and warm beige
• Maker and Mark: Naturally occurring fossil specimen. No visible maker's mark.
• Pattern or Model: Hexagonaria fossil coral pattern consistent with a Petoskey Stone
• Style: Natural history, geological specimen, rockhound collectible
• Dimensions: Approximately 2 inches long. Width and depth not confirmed from photos. Weight approximately 2 ounces.
• Special Features: Partially polished surface exposes numerous individual coral structures while the reverse remains largely natural and unpolished.

Condition Grade: Very Good

Positives

• Graded Very Good: This natural fossil specimen presents well with a glossy polished face and clearly visible coral pattern.
• The polished portion shows numerous distinct dark coral centers surrounded by fine radiating structures.
• The stone remains substantial enough to hold comfortably in the hand while displaying the fossil pattern clearly.

Issues / Wear

• The specimen is only partially polished. Much of the reverse remains rough, matte, and naturally porous.
• Natural pits, cavities, color variation, and irregularities are visible on the unpolished areas and are part of the fossil stone.

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 associated with Michigan and are recognized by their repeating coral cells with radiating internal lines.

This small specimen suits a Michigan collector, fossil enthusiast, rockhound, geology display, or someone looking for a compact piece connected with Great Lakes natural history.

This particular stone is worth noticing because one side has been polished enough to reveal a strong dark fossil pattern while the opposite side retains its natural texture.

It is the kind of small geological piece that rewards being picked up and examined from every angle.

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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.

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