Fossil identification

[Nikileec]

Found this among native american artifacts and I'm wondering what type of fossil it is. Notice the crystal in the center.

 

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[CaptEsteban]

I believe it is a concretion. Scroll down to " bone shaped concretions."

What Do Concretions Look Like?

Concretions are cemented bodies of sediment that are found in sedimentary rock or soil and mostly spherical in shape.

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