How to Hand Polish a Petoskey Stone

Learn how to hand polish a Petoskey stone without any expensive machinery.

The Petoskey stone (Hexagonaria percarinata) is an approximately 360 million old fossilized coral. It is the state stone of Michigan. Petoskey stones are calcite which is very soft, approximately 3 on the Mohs scale.

If you have a tumbler, you can save a lot of time by doing the first couple stages in the tumbler and then hand polishing to finish them up. https://youtu.be/IBRq7dPD0Lk

Another video of me collecting Petoskey stones and pudding stones in Lake Huron:
https://youtu.be/VfSquWyyRKI

This is a good place to buy aluminum oxide polish:
https://www.rockshed.com/rock-shop/rock-tumblers-supplies/rock-tumbling-grit-and-accessories/aluminum-oxide-polish/

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Видео How to Hand Polish a Petoskey Stone канала Michigan Rocks