Hard mineral composed of silicon dioxide
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Related clues
- Natural crystalline silica
- Mineral tinged with impurities giving a variety of shades
- Minecraft item found in the Nether
- The crystal in some crystal balls
- 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
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