'Pottery' in the Bible

and thou hast gone forth unto the valley of the son of Hinnom, that is at the opening of the gate of the pottery, and hast proclaimed there the words that I speak unto thee,

Wail and cry out in anguish, you rulers! Roll in the dust, you who shepherd flocks of people! The time for you to be slaughtered has come. You will lie scattered and fallen like broken pieces of fine pottery.