rock crystal vs transparent quartz

rock crystal and transparent quartz both are nouns.

Word	Noun	Adjective	Verb	Adverb
rock crystal	Yes	No	No	No
transparent quartz	Yes	No	No	No

As nouns, rock crystal and transparent quartz are synonyms defined as:

rock crystal and transparent quartz: a clear quartz used in making electronic and optical equipment

rock crystal (noun)	transparent quartz (noun)
a clear quartz used in making electronic and optical equipment	a clear quartz used in making electronic and optical equipment