What part of speech is crystalize?

Crystalize can be categorized as a verb.

Parts of speech

1. crystalize is a verb, present, 1st person singular of crystalize (infinitive).
2. crystalize is a verb (infinitive).

Verb
crystalize - cause to form crystals or assume crystalline form; "crystallize minerals"
crystalize - assume crystalline form; become crystallized
crystalize - make free from confusion or ambiguity; make clear; "Could you clarify these remarks?"; "Clear up the question of who is at fault"
crystalize - cause to take on a definite and clear shape; "He tried to crystallize his thoughts"