Man Made?

[Hughett]

I found these rocks in the woods. Not to far from each other. They look man made to me. They’re not heavy, and almost like a sandstone if not sandstone. Found in NW Ga.
The pennies are for size reference.
Any ideas?

 

[Icewing]

Basalt, commonly called native stone (at least around here)

 

[ToddsPoint]

I could see the triangular one being natural but the other two are suspiciously rectangular. I'd say man made on those two. Gary

 

[Johnbrian]

Sharpening stones?