✅ SOLVED Did a new site survey today and found these unusual pieces. Are they just rocks? #2

[creskol]

(The pics here are of Rock 2) (Rocks 1 & 3 will be in separate posts)

Rocks 1 and 2 are heavy, but they look like fired clay?
Rock 3 has a definite beveled edge that is significantly smoother that the rest of the surface.
Are these just simple rocks or artifacts of some sort?