Greek Strong's Dictionary with all the Synonyms inserted into the definitions.
Greek Synonyms inserted into Greek Strong's Dictionary
2929 + clear + as crystal +/ . krustallizo {kroos-tal-lid'-zo}; from 2930 + as crystal + unto crystal +/ ; to make (i .e . intransitively, resemble) ice ("crystallize"): --be clear as crystal .
2930 + as crystal + unto crystal +/ . krustallos {kroos'-tal-los}; from a derivative of kruos (frost); ice, i .e . (by analogy) rock "crystal": --crystal .