Hard mineral consisting of silicon dioxide in crystal form
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Related clues
- Colourless glass made of almost pure silica
- Mineral of which amethyst, cairngorm and citrine are varieties
- Hard mineral composed of silicon dioxide
- Silicon mineral
- 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
Possible answers
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