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Petoskey stones are small water worn stones from Michigan. They are a petrified/fossilized calcium replacement of a variety of coral and the state stone for Michigan. The blue/gray to tan colored stones have a very interesting pattern when oriented properly during sawing, grinding or tumbling. This is a soft material which can be used for tumbling, carving or slab for unique cabochons. Note the beautiful Petoskey stone cabochon shown in the picture to the left. Special precedures are required for tumble polishing Petoskey due to their hardness of around 3 on the Mohs scale. Click on this link for a suggested way of Polishing Petoskey stone sent in by Kathy Miling of Michigan. Her polish is superb! Sizes are mostly very small and will run from 1" X 1 1/2" to a few up to one third of a pound each. One order will contain one pound of assorted sizes of Petoskey Stone. When you receive your Petoskey Stone, wet the stone to see the interesting pattern.
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