Is this pottery?

[autographcollector11]

It looks to be clay. It is tempered with what appears to be sand and very small pebbles.
it has a slight curved shape as well as what appears to be part of a rim.
Found in Illinois

 

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[GaRebel1861]

It looks like pottery to me in the pictures.

 

[Buckleberry]

Yeppers, that's a pottery shard, the clay is infused with grog, typically sand, mica,freshwater shell or a combo., grog is used to prevent excessive shrinking during firing so the pot doesn't crack or split
Very good chance there's more where that was found.

 

[NCPeaches]

Looks like pottery to me.

 

[RGINN]

Finding pottery sherds usually indicates a long term camp site, so spend a little time looking that area over.