Collecting Cool Rocks! Minerals, Crystals, Fossils, Geodes, etc.

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Here in Northern MI, a lot of people collect Petoskey stones. Here are some we've found:
20201212_143000.jpg 20201212_142944.jpg
Some places to find them are around rivers and lakes, especially in the spring, after the first big snow/ice melts.

I think they are some kind of fossilized coral, and here is what they supposedly looked like when they were alive:
coral.jpg
 

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