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Is this bone or some other type of rock?

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I can't remember where exactly I grabbed this rock, but it resembles bone I think?  Either way, it seems unusual so I was wondering if anyone here might be able to help me figure it out. 



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Lone Hunter

It's not bone and hard to tell if it's more than a concretion without clearer picture.  Someone else might can determine that however.

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Just looks like limestone to me, unfortunately.

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If it were a bone it would be a patella. But it's not. :)

I think weathering of stone, possibly limestone, is the call.

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