Strong's #2635: chacaph (pronounced khas-af')
(Aramaic) from a root corresponding to that of 2636; a clod:--clay.
Brown-Driver-Briggs Hebrew Lexicon:
1) clay, potsherd
Part of Speech: noun masculine
Relation: from a root corresponding to that of H2636
This word is used 9 times:
Daniel 2:33: "iron and part of clay."
Daniel 2:34: "the image his feet that were of iron and clay, and broke them to pieces."
Daniel 2:35: "Then was the iron, the clay, the brass, the silver, and the gold, broken to pieces together,"
Daniel 2:41: "part of potters' clay, and part the kingdom shall be"
Daniel 2:41: "forasmuch as thou sawest the iron mixed with miry clay."
Daniel 2:42: "were part of iron, and part of clay, so the kingdom shall be partly"
Daniel 2:43: "iron mixed with miry clay, they shall mingle themselves with the seed"
Daniel 2:43: "iron is not mixed with clay."
Daniel 2:45: "of the mountain without hands, and that it broke in pieces the brass, the clay,"