Petoskey Stones
That one I don't have to google, I already know. In fact I have them. An office colleague is from Michigan and she brought me some. They are beautiful!
They are Devonian Corals, did you know that? :)
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I didn't know that! It's crazy just how many of them there are. When you polish them up they look really awesome too. I still have a rock tumbler stored in my garage somewhere.