Crossword Genius

Silica mineral (6)

Ross

I believe the answer is:

quartz

<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">silica mineral</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is the entire clue.<br/ ></span>

(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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