crystal
Ezekiel 1:22
And the likeness of the firmament upon the heads of the living creature was as the colour of the terrible crystal, stretched forth over their heads above.
Revelation 4:6
And before the throne there was a sea of glass like unto crystal: and in the midst of the throne, and round about the throne, were four beasts full of eyes before and behind.
Revelation 21:11
Having the glory of God: and her light was like unto a stone most precious, even like a jasper stone, clear as crystal;
Revelation 22:1
And he shewed me a pure river of water of life, clear as crystal, proceeding out of the throne of God and of the Lamb.