'Crystal' in the Bible

“Coral and crystal are not to be mentioned;And the acquisition of wisdom is above that of pearls.

“Moreover, I will make your battlements of rubies,And your gates of crystal,And your entire wall of precious stones.

Now over the heads of the living beings there was something like an expanse, like the awesome gleam of crystal, spread out over their heads.

and before the throne there was something like a sea of glass, like crystal; and in the center and around the throne, four living creatures full of eyes in front and behind.

Then he showed me a river of the water of life, clear as crystal, coming from the throne of God and of the Lamb,