4 verses have
clay
in Edition Clear Qur'an by Talal Itani / Al-Hijr (The Rock)

15:26We created the human being from clay, from molded mud.

15:28Your Lord said to the angels, “I am creating a human being from clay, from molded mud.”

15:33He said, “I am not about to prostrate myself before a human being, whom You created from clay, from molded mud.”

15:74And We turned it upside down, and rained down upon them stones of baked clay.