'Crystal' in the Bible

and in front of the throne there was something like a sea or large expanse of glass, like [the clearest] crystal. In the center and around the throne were four living creatures who were full of eyes in front and behind [seeing everything and knowing everything that is around them].

having God’s glory [filled with His radiant light]. The brilliance of it resembled a rare and very precious jewel, like jasper, shining and clear as crystal.

Then the angel showed me a river of the water of life, clear as crystal, flowing from the throne of God and of the Lamb (Christ),