Piezoelectric, and notably used in quartz clock.
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Quartz is a crystalline form of silicon dioxide, . Its ordered structure distinguishes it from amorphous silica glass.
It is piezoelectric material: suitable mechanical deformation changes electric polarization. Quartz resonators exploit the reproducible mechanical resonance of a shaped crystal to stabilize an oscillator, linking crystal symmetry with time and frequency measurement.
Quartz is a widely abundant mineral composed of silicon dioxide (SiO₂). It is one of the most common minerals in the Earth's crust and can be found in a variety of geological environments. Quartz is characterized by its hardness (it has a rating of 7 on the Mohs scale), which makes it resistant to weathering, and its chemical durability.