petrified wood cabochon cut by Sam Silverhawk; an unsual and rare form from Hell's Canyon near the Idaho/Oregon border
Petoskey Stones were formed by the fossilization of ancient coral, Hexagonaria. The coral lived in shallow waters. Petoskey Stones are found on many beaches of Lake Michigan and Lake Huron, as well as in rock quantities from Traverse City to Alpena. The honeycomb patterned stone has a hardness from 4 to 5.
A Petoskey stone .is a rock and a fossil, often pebble-shaped, that is composed of a fossilized coral that lived 350 million years ago. The rocks rounded in the surf along the shores of Lake Michigan near Petoskey, Michigan.
frontal-cortex: Scanning electron microscope picture of a nerve ending that has been broken open to reveal the synaptic vesicles beneath the cell membrane. Image by Tina Carvalho. The Cell: An Image Library
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. Only found in Lake Michigan off Petoskey, Michigan
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.