calcite vs onyx marble

calcite and onyx marble both are nouns.

Word	Noun	Adjective	Verb	Adverb
calcite	Yes	No	No	No
onyx marble	Yes	No	No	No

As nouns, onyx marble is a hyponym of calcite; that is, onyx marble is a word with a more specific, narrower meaning than calcite:

calcite: a common mineral consisting of crystallized calcium carbonate; a major constituent of limestone
onyx marble: a hard compact kind of calcite

Other hyponyms of calcite include alabaster, Mexican onyx, oriental alabaster, chalk, Iceland spar.

calcite (noun)	onyx marble (noun)
a common mineral consisting of crystallized calcium carbonate; a major constituent of limestone	a hard compact kind of calcite