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Quartz
01
colorless glass made of almost pure silica
02
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
例
Minerals like quartz and feldspar occur in many types of rocks.
The geologist discovered veins of quartz impregnated with gold deposits deep within the earth.
As a crystallographer, she discovered a new form of quartz.
Pendulum clocks were widely used before the invention of quartz and atomic clocks.
