Crossword Genius

Compound in quartz (6)

Ross

I believe the answer is:

silica

'compound in quartz' is the definition.
(I've seen this before)

This is all the clue.

(Other definitions for silica that I've seen before include "Common base of rock" , "Compound in quartz" , "Hard colourless compound from rocks" , "Mineral found as quartz and opal" , "Quartz used in the manufacture of glass" .)

I've seen this clue in The Times.
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