Hard mineral consisting of silicon dioxide in crystal form
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Related clues
- Which kind of crystal is found in many watches and clocks?
- Mineral tinged with impurities giving a variety of shades
- Thought by Theophrastus to be a form of permanent ice, a silicious piezoelectric mineral such as the purple amethyst, smoky-brown cairngorm or the yellow citrine
- Commonest rock-forming mineral
- Hard mineral such as amethyst or citrine, say
Possible answers
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