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Related Clues:
- Type of watch and crystal
- Silicon dioxide used as a gemstone
- Mineral used in modern timepieces
- Hard mineral in timepieces
- Colourless mineral used to make glass
- Crystal in some watches
- Sand ingredient
- Silicon mineral
- Mineral - at least half a gallon it's said
- Glass, its capacity unknown
- Hard glassy mineral
- Colourless/white mineral
- Rock-forming mineral
- Mineral; Pilsen (anag.)
- Hard silica mineral