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The principal special property of quartz is that it is piezo-electric. That is if you apply a voltage to two opposing faces, the crystal will change shape; and vice versa.

This is the device that in your phone/alarm clock/microwave that goes peep peep peep.

Small pieces of quartz are shaped so that they operate (vibrate) at your target frequency, be it for a watch alarm, or a GPS receiver.

Other materials may also be used for this purpose, but quartz is easily fabricated.

p.s. Your bones are also piezoelectric, and the electrical signals given out by the stresses put on the bone, will aid in shaping the bone to best respond to that stress. Very clever!

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