Pottery shard?

[Arrow1491]

I am having trouble with this one....looks like clay, but does the temper look like grit?
Is it pottery?
From Illinois.....
Thanks

 

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[NCPeaches]

Yes that's a shard but I'm not sure what your people used to temper it with. That's a great find and you have a good eye!

 

[monsterrack]

There looks to be some shell in that piece of pottery.