A mineral consisting of silicon dioxide occurring in colorless and transparent or colored hexagonal crystals or in crystalline masses
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Related clues
- Glassy mineral
- Rock-forming mineral
- Citrine or amethyst
- Crystal with rose, blue and smoky varieties and other forms including amethyst, aventurine and citrine
- 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
- Q
- U
- A
- R
- T
- Z