An Etymological Dictionary of Astronomy and Astrophysics

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فرهنگ ریشه‌شناختی اخترشناسی-اخترفیزیک

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silica
  سیلیس  
silis (#)
Fr.: silice  

A widely found mineral of silicon dioxide SiO2, which is used as an ore of → silicon. It is
a hard, white, or colorless crystalline compound with a high melting point, occurring abundantly as quartz, sand, flint, rock crystal, etc.

See also: From L. silic- stem of → silex “hard stone, flint, boulder.”