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quartz (n.)

common form of native silica or silicon dioxide, 1756, from German Quarz, Zwarc "rock crystal," from Middle High German twarc, probably from a West Slavic source, compare Czech tvrdy, Polish twardy "quartz," noun uses of an adjective meaning "hard," from Old Church Slavonic tvrudu "hard," from Proto-Slavic *tvrd-, from PIE *(s)twer- "to grasp, hold; hard."

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Definitions of quartz from WordNet

quartz (n.)
colorless glass made of almost pure silica;
Synonyms: quartz glass / vitreous silica / lechatelierite / crystal
quartz (n.)
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;
From wordnet.princeton.edu