Crystal: (Ezekiel 1:22) with the epithet "terrible," as dazzling the spectators with
its brightness). The word occurs in
(Revelation 4:6; 21:11; 22:1) It is a stone
of the flint order, the most refined kind of quartz. The Greek word
here used means also literally "ice." The ancients regarded the
crystal as only pure water congealed into extreme hardness by great
length of time.