Daniel 2:33

2:33 Its legs were of iron; its feet were partly of iron and partly of clay. ¹ 

Daniel 2:42

2:42 In that the toes of the feet were partly of iron and partly of clay, the latter stages of this kingdom will be partly strong and partly fragile.

[2:33]  ¹ sn Clay refers to baked clay, which – though hard – was also fragile. Cf. the reference in v. 41 to “wet clay.”