Clay is mentioned in the Quran in these verses:
[3:49] As a messenger to the Children of Israel: “I come to you with a sign from your Lord – I create for you from clay the shape of a bird, then I blow into it, and it becomes a live bird by God’s leave. I restore vision to the blind, heal the leprous, and I revive the dead by God’s leave. I can tell you what you eat, and what you store in your homes. This should be a proof for you, if you are believers.
[5:110] God will say, “O Jesus, son of Mary, remember My blessings upon you and your mother. I supported you with the Holy Spirit, to enable you to speak to the people from the crib, as well as an adult. I taught you the scripture, wisdom, the Torah, and the Gospel. Recall that you created from clay the shape of a bird by My leave, then blew into it, and it became a live bird by My leave. You healed the blind and the leprous by My leave, and revived the dead by My leave. Recall that I protected you from the Children of Israel who wanted to hurt you, despite the profound miracles you had shown them. The disbelievers among them said, `This is obviously magic.’
[15:26] We created the human being from aged mud, like the potter’s clay.
[15:28] Your Lord said to the angels, “I am creating a human being from aged mud, like the potter’s clay.
[15:32] He said, “O Iblis (Satan), why are you not with the prostrators?”
[15:33] He said, “I am not to prostrate before a human being, whom You created from aged mud, like the potter’s clay.”
[32:7] He is the One who perfected everything He created, and started the creation of the human from clay.
[38:71] Your Lord said to the angels, “I am creating a human being from clay.
[38:76] He said, “I am better than he; You created me from fire, and created him from clay.”
[51:33] “We will shower them with rocks of clay.
[55:14] He created the human from aged clay, like the potter’s clay.
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