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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 or grinding. 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 procedures are required for tumble polishing Petoskey due to their hardness of around 3 on the Mohs scale. Kathy Miling of Michigan has a polishing technique that is superb! Check out the link below. Sizes of the Petoskey stones 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. You will need to slab parallel to the growth rings for the best possible pattern for cabochons or just polishing a half nodule.
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