Petoskey stone is a rock and a fossil, often pebble-shaped, that is composed of a fossilized coral. The stones were formed as a result of glaciation. Petoskey was the state mineral of Michigan during the
Hag stones, holey stones or witch stones -- rocks with a naturally occurring hole in them are said to give humans the ability to peer into the world of Faerie when they close one eye and peer through the hole.
Found lots of Petoskey stones and still search.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.