Could these be native american pottery pieces??

[josephbjr]

Found these threw my times of artifact hunting, some looked like ancient pottery pieces but I'm far from a professional and was wanting more opinions, the rock material is different and i'm unfamiliar with it. was hoping someone would know about these pieces, or about the kind of rock/material they are. Thank you!







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[sandchip]

The only pottery I see is the piece at upper left, but it's glazed "white man" pottery more than likely from the last half of the 1800s.

 

[monsterrack]

Just what sandchip said.