Appears 4 times in the Quran.
And certainly We created man of clay that gives forth sound, of black mud fashioned in shape.
15:28 وَإِذْ قَالَ رَبُّكَ لِلْمَلَٰٓئِكَةِ إِنِّى خَٰلِقٌۢ بَشَرًا مِّن صَلْصَٰلٍ مِّنْ حَمَإٍ مَّسْنُونٍ
And when your Lord said to the angels: Surely I am going to create a mortal of the essence of black mud fashioned in shape.
He said: I am not such that I should make obeisance to a mortal whom Thou hast created of the essence of black mud fashioned in shape.
He created man from dry clay like earthen vessels,