Crystal. This word occurs in the Common English Version of Job 28:17. The R. V. reads "glass." The original term signifies something of exceeding purity. The Egyptians had the secret of introducing gold between two surfaces of glass, together with various colors. They could also enamel upon gold. It is very likely that a reference to some such work of art is intended. The word rendered "crystal" in Ezekiel 1:22, is elsewhere "ice" or "frost." The margin of the B. V. reads "ice" here also. It is probably called "terrible" because of the bright shining of such a substance in the rays of the sun, dazzling and blinding the eye that looks on it. We further find "crystal," the rock crystal, in Revelation 4:6; Revelation 22:1; also the epithet crystal-clear is given to jasper. Revelation 21:11.