1. Colourless glass made of almost pure silica
   - quartz glass, vitreous silica, lechatelierite, crystal 
2. 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

Sounds like: courts, quarts

Derived forms: quartzes

See also: quartzose

Type of: mineral, natural glass

Encyclopedia: Quartz

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