crystal clear vs crystalline

crystal clear and crystalline both are adjectives.

Word	Noun	Adjective	Verb	Adverb
crystal clear	No	Yes	No	No
crystalline	No	Yes	No	No

As adjectives, crystal clear and crystalline are synonyms defined as:

crystal clear and crystalline: transmitting light; able to be seen through with clarity

Other synonyms of crystal clear include limpid, lucid, pellucid, transparent.

crystal clear (adjective)	crystalline (adjective)
(of language) transparently clear; easily understandable	consisting of or containing or of the nature of crystals
transmitting light; able to be seen through with clarity	transmitting light; able to be seen through with clarity
	distinctly or sharply outlined