alabastrine vs alabaster

alabastrine is not a noun while alabaster is a noun.

Word	Noun	Adjective	Verb	Adverb
alabastrine	No	Yes	No	No
alabaster	Yes	Yes	No	No

As adjectives, alabastrine and alabaster are synonyms defined as:

alabastrine (noun)	alabaster (noun)
	a very light white
	a compact fine-textured, usually white gypsum used for carving
	a hard compact kind of calcite

alabastrine (adjective)	alabaster (adjective)
of or resembling alabaster	of or resembling alabaster