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Electronic
integrated circuit
crystal Si
(semiconductor)
amorphous SiO2
(insulator)
Transmission
path - optical fiber
a/l= −0.2dB/km
amorphous SiO2
(silica glass)
High-Q
piezoelectric
mechanical
resonator
crystal SiO2
(quartz)
Element silicon
14Si
27.7% Earth's crust
95% minerals