Bible Verses About Adamant: A flint.

I have made thy face like an adamant and like flint: fear them not, neither be thou dismayed at their presence: for they are a provoking house.

And they made their heart as the adamant stone, lest they should hear the law, and the words which the Lord of hosts sent in his spirit by the hand of the former prophets: so a great indignation came from Lord of hosts.