Petoskey stone sterling silver pendant

Petoskey stone sterling silver pendant Stamped STARBORN 925 Petoskey stone - is a rock and a fossil, often pebble-shaped, that is composed of a fossilized rugose coral. 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.