Strong's:κρύσταλλος ice, i.e. (by analogy) rock "crystal"Derivation: from a derivative of κρύος (frost);KJV Usage: crystal.
TBESG:κρύσταλλοςcrystalG:N-M κρύσταλλος, -ου, ὁ (< κρύος, frost), [in LXX: Refs Job.38:29, Psa.147:17, Eze.1:22 (קֶרַח), etc. ;] crystal: Refs Rev.4:6 22:1.† (AS)
κρύσταλλος krustallos kroos'-tal-los From a derivative of κρύος kruos (frost); ice, that is, (by analogy) rock “crystal” KJV Usage: crystal.
κρυσταλλίζω krustallizō kroos-tal-lid'-zo From G2930; to make (that is, intransitively resemble) ice (“crystallize”)KJV Usage: be clear as crystal.