Please ID

[Boringrat]

I may just be crazy or simply missing what this could be. It's just strange every angle I look at it. Found it by a mound... Thanks

Sorry for so many pics but I just wanted to show many angles

 

[Catobra]

Old mortar from ceramic tile?

 

[Boringrat]

Ah I knew that pattern looked familiar just couldn't place it! Threw me off! Thanks

 

[Catobra]

Welcome!