Custom Cut Polished & Wire Wrapped Petoskey Stone Bracelet 6 3/4 Michigan State Stone .935
The “Petoskey Stone,” which became the official state stone of Michigan in 1965, is actually a petrified fossil coral of the genus hexagonaria. Approximately 350 million years ago, a warm, saltwater sea covered Michigan. In the depths of this sea, the members of the colony coral lived.
A Petoskey stone is a rock and a fossil, often pebble-shaped, that is composed of a fossilized rugose coral, Hexagonaria percarbonate. Such stones were formed as a result of glaciation, in which sheets of ice plucked stones from the bedrock, grinding off their rough edges and depositing them in the northwestern (and some in the northeastern) portion of Michigan's lower peninsula.