Crossword Genius

___ gel (drying agent that comes in small packets) (6)

Ross

I believe the answer is:

silica

(Other definitions for silica that I've seen before include "Eg, quartz" , "Quartz used in the manufacture of glass" , "Constituent of sandstone and quartz" , "Main constituent of sand" , "Common base of rock" .)

I've seen this clue in The New York Times.
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