chalcanthite vs blue stone

chalcanthite and blue stone both are nouns.

Word	Noun	Adjective	Verb	Adverb
chalcanthite	Yes	No	No	No
blue stone	Yes	No	No	No

As nouns, chalcanthite and blue stone are synonyms defined as:

chalcanthite and blue stone: hydrated blue crystalline form of copper sulfate

Other synonyms of chalcanthite include blue copperas, blue vitriol.

chalcanthite (noun)	blue stone (noun)
hydrated blue crystalline form of copper sulfate	hydrated blue crystalline form of copper sulfate