Quartz crystal
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Quartz crystal (from German Quarz) is the second most abundant mineral in the Earth's continental crust (after feldspar). It is made up of a continuous framework of SiO4 silicon-oxygen tetrahedra, with each oxygen being shared between two tetrahedra, giving an overall formula SiO2.
[edit] Also See:
- Freestyle Timing Booklet
- Data Service Requirements World Cup
- Freestyle Equipment List
- Clockwork mechanisms
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