sand vs quartz sand

sand and quartz sand both are nouns.

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

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

sand: a loose material consisting of grains of rock or coral
quartz sand: sand that is mainly composed of quartz, used as the main raw material for commercial glass production.

sand (noun)	quartz sand (noun)
fortitude and determination	sand that is mainly composed of quartz, used as the main raw material for commercial glass production.
a loose material consisting of grains of rock or coral

sand (verb)	quartz sand (verb)
rub with sandpaper