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Petoskey stone
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Petoskey stone - Wikipedia
https://en.wikipedia.org/wiki/Petoskey_stone
Petoskey stone
r/geology - Polishing a bomb Petoskey Stone from Michigan!! Gonna take time to perfect it.
https://www.reddit.com/r/geology/comments/acn608/polishing_a_bomb_petoskey_stone_from_michigan/
Petoskey stone