'Crystal' in the Bible

Corals and crystal are no more remembered; yea, the acquisition of wisdom is above rubies.

And there was the likeness of an expanse over the heads of the living creature, as the look of the terrible crystal, stretched forth over their heads above.

and before the throne, as a glass sea, like crystal. And in the midst of the throne, and around the throne, four living creatures, full of eyes, before and behind;

And he shewed me a river of water of life, bright as crystal, going out of the throne of God and of the Lamb.