quartz vs citrine

quartz and citrine both are nouns.

Word	Noun	Adjective	Verb	Adverb
quartz	Yes	No	No	No
citrine	Yes	No	No	No

As nouns, citrine is a hyponym of quartz; that is, citrine is a word with a more specific, narrower meaning than quartz:

quartz: a hard glossy mineral consisting of silicon dioxide in crystal form; present in most rocks (especially sandstone and granite); yellow sand is quartz with iron oxide impurities
citrine: semiprecious yellow quartz resembling topaz

quartz (noun)	citrine (noun)
a hard glossy mineral consisting of silicon dioxide in crystal form; present in most rocks (especially sandstone and granite); yellow sand is quartz with iron oxide impurities	semiprecious yellow quartz resembling topaz
colorless glass made of almost pure silica