κρύσταλλος G2930
krýstallos · kroos'-tal-los · Noun Masculine
from a derivative of (frost); ice, i.e. (by analogy) rock "crystal":--crystal.
2 Occurrences in the King James Bible
Revelation 4:6And 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 22:1And he shewed me a pure river of water of life, clear as crystal, proceeding out of the throne of God and of the Lamb.