'Metal' in the Bible

Can you, with him, spread out the sky, which is strong as a cast metal mirror?

I looked, and behold, a stormy wind came out of the north, a great cloud, with flashing lightning, and a brightness around it, and out of its midst as it were glowing metal, out of the midst of the fire.

I saw as it were glowing metal, as the appearance of fire within it all around, from the appearance of his waist and upward; and from the appearance of his waist and downward I saw as it were the appearance of fire, and there was brightness around him.

Then I saw, and behold, a likeness as the appearance of fire; from the appearance of his waist and downward, fire; and from his waist and upward, as the appearance of brightness, as it were glowing metal.