Names for Category "Quartz varieties" 

	1.	Agate    Greek loanwords, Minerals, Quartz varieties
	2.	Flint    Building stone, Chert, Firelighting, Flint buildings, Lithics, Mineralogy, Minerals, Quartz varieties, Sedimentary rocks, Symbols of Ohio
	3.	Opal    Gemstones, Glass in nature, Hydrates, National symbols of Australia, Quartz varieties