'Clay' in the Bible

its legs made of iron, and its feet made partly of iron and partly of clay.

"As you were watching, a rock was quarried but not with human hands and it struck the iron and clay feet of the statue, breaking them to pieces.

Then the iron, the clay, the bronze, the silver, and the gold were broken in pieces together and became like chaff from a summer threshing floor that the breeze carries away without leaving a trace. Then the rock that struck the statue grew into a huge mountain and filled the entire earth.

"The feet and toes that you saw, made partly of potter's clay and partly of iron, represent a divided kingdom. It will still have the strength of iron, in that you saw iron mixed with clay.

Just as their toes and feet are part iron and part clay, so will the kingdom be both strong and brittle.

Just as you saw iron mixed with clay, so they will mix themselves with human offspring. Furthermore, they won't remain together, just as iron doesn't mix with clay.

Now, just as you saw that the stone was cut out of the mountain without human hands and that it crushed the iron, bronze, clay, silver, and gold to pieces so also the great God has revealed to the king what will take place after this. Your dream will come true, and its meaning will prove trustworthy."