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A Petoskey stone is a rock and a fossil, often pebble-shaped, that is composed of a fossilized rugose coral, Hexagonaria percarinata.he 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.
The living coral that turned into the Petoskey stone thrived on plankton that lived in the warm sea. Calcite, silica and other minerals have replaced the first elements of each cell. Each separate chamber, then, on each Petoskey stone, was a member of a thriving colony of living corals.For that reason the Petoskey stone is called a colony coral. The picture below illustrates the six sided formation left from the living coral colonies found on the Petoskey stone.ach separate chamber, then, on each Petoskey stone, was a member of a thriving colony of living corals. For that reason the Petoskey stone is called a colony coral. The picture below illustrates the six sided formation left from the living coral colonies found on the Petoskey stone.