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Fossil or not?

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14 hours ago, RockandFound said:

That looks like someone I picked up last week does I have bands are in like a tree growing. 

No. It does not have annular rings. It actually has a radial pattern.

There is a silica core and a silica "skin" toward the outside. The rest is grey limestone.

I'm not sure where you draw the line between fossil and concretion. I think this little piece falls in that grey area.

The shape was definitely influenced by some kind of living organism. Exactly what I don't know. 

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