Job 28:2

Iron -As has been remarked above, iron was early known, yet probably its common use indicates a more advanced state of civilization than that of gold and silver. The Mexicans were ignorant of the use of iron, though ornaments of gold and silver elegantly worked abounded among them. Iron is less easily discovered than copper, though more abundant, and is worked with more difficulty. Among the ancient nations, copper was in general use long before iron; and arms, vases, statues, and implements of every kind were made of this metal alloyed and hardened with tin, before iron came into general use.