Strong's G2929 — κρυσταλλίζω (verb)
krustallizo (kroos-tal-lid'-zo) v.
1. to make (i.e. intransitively, resemble) ice ("crystallize")
[from G2930]
KJV: be clear as crystal 
Root(s): G2930 
Hebrew root: κρύσταλλος
Occurrences: 1