Native american pottery?

[Unitedstatesofamerica1]

 

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[NCPeaches]

It's hard to tell since it looks like it has temper in it but it's not curved at all and that's one of the telling signs that it is, honestly I don't know. Hopefully someone else will come along and give input.

 

[rock]

Id say no

 

[Treasure_Hunter]

No size reference, size reference is always helpful, I would also have to say no from pictures posted, all are flat and the edges visible do not look like pottery.

 

[Neanderthal]

I don't believe it's pottery. It looks more like natural sedimentary stone.