Iron

Genesis 4:22
Zillah also gave birth to Tubal-cain, a forger of every implement of bronze and iron. And the sister of Tubal-cain was Naamah.

Numbers 31:22
Only the gold, silver, bronze, iron, tin, and lead--

Deuteronomy 8:9
a land where you will eat food without scarcity, where you will lack nothing; a land whose rocks are iron and whose hills can be mined for copper.

1 Chronicles 22:14
Now behold, I have taken great pains to provide for the house of the LORD--100, 000 talents of gold, 1, 000, 000 talents of silver, and bronze and iron too great to be weighed. I have also provided timber and stone, but you will need to add to them.

earth.