A Petoskey stone is a rock and a fossil, often pebble-shaped, that is composed of a fossilized coral, Hexagonaria percarinata. They are fragments of a coral reef that was originally deposited during the Devonian period, about 350 million years ago. (Wikipedia) Photo by Mark Willocks.

A Petoskey stone is a rock and a fossil, often pebble-shaped, that is composed of a fossilized coral, Hexagonaria percarinata. They are fragments of a coral reef that was originally deposited during the Devonian period, about 350 million years ago. (Wikipedia) Photo by Mark Willocks.

Five tips for finding and polishing Petoskey stones, fossilized ancient coral found on the beaches in the shallows of Lake Michigan along the Northern Michigan coast.

Five tips for finding and polishing Petoskey stones, fossilized ancient coral found on the beaches in the shallows of Lake Michigan along the Northern Michigan coast.

Amazonite and Petoskey Stone Sterling Silver by theglassbird

Amazonite and Petoskey Stone Sterling Silver Necklace

Petoskey Stones, the state stone of Michigan, are fossilized coral resulting from glaciation and are often polished to reveal the beautiful pattern of the 6 sided coral colonies. #Geology #Petoskey_Stone #Michigan

Petoskey Stones, the state stone of Michigan, are fossilized coral resulting from glaciation and are often polished to reveal the beautiful pattern of the 6 sided coral colonies. #Geology #Petoskey_Stone #Michigan

Petoskey Stone - okay, so this is not technically a place or a space, but something found only in one of my favorite places...

Petoskey Stone - okay, so this is not technically a place or a space, but something found only in one of my favorite places...

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