Flat Square with Rounded Edges, Hand-Polished Square Bead with 1.5mm hole.
 
Hexagonaria percarinata, also known as Petoskey Stone, is a rock and a fossil, often pebble-shaped, that is composed of a fossilized rugose coral, Hexagonaria percarinata. The 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. In those same areas of Michigan, complete fossilized coral colony heads can be found in the source rocks for the Petoskey stones.
 
The name comes from an Ottawa Indian Chief, Chief Pet-O-Sega.
 
 
***************************
* Photos show all sides.
* Sizes, shapes and colors my vary due to being a natural stone, being hand-carved and/or difference in computer monitors.