- [U]石英 a hard mineral substance,often in the form of crystals
colorless glass made of almost pure silica
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
Quartz crystal is perfectly crystallized.
Quartz crystals are seldom used in such handsets.
There is a great deal quartz in those mountains.