Crossword Genius

Silica mineral (6)

Ross

I believe the answer is:

quartz

'silica mineral' is the definition.
(I've seen this before)

This is the entire clue.

(Other definitions for quartz that I've seen before include "Hard mineral in timepieces" , "Hard glossy mineral present in many rocks" , "Colourless mineral used to make glass" , "Type of watch and crystal" , "Glassy mineral" .)

I've seen this clue in The Sunday Times.
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