'Crystal' in the Bible

Neither gold nor crystal can be compared with it, nor can a vase of gold match its worth.

and in front of the throne was something like a sea of glass, like crystal. In the middle of the throne and around the throne were four living creatures full of eyes in front and in back.

Then the angel showed me the river of the water of life -- water as clear as crystal -- pouring out from the throne of God and of the Lamb,