any of various crystallized forms of silica that are transparent, translucent, or colored, used in many ways, esp. as a gem or in making glass, lenses, or quartz crystals
Origin of quartzGerman quarz from uncertain or unknown; perhaps
A very hard mineral composed of silica, SiO2, found worldwide in many different types of rocks, including sandstone and granite. Varieties of quartz include agate, chalcedony, chert, flint, opal, and rock crystal.
Origin of quartzGerman Quarz from Middle High German quarc of Slavic origin
(countable and uncountable, plural quartzes)