You know the Quartz Crystal used in Crystal Oscillators?

The Quartz Crystal used in Crystal Oscillators is a very small, thin piece or wafer of cut Quartz with the two parallel surfaces metallized to make the electrical connections. The physical size and thickness of a piece of Quartz Crystal is tightly controlled since it affects the final frequency of oscillations and is called the crystals "characteristic frequency". Then once cut and shaped the crystal can not be used at any other frequency. The crystals characteristic or resonant frequency is inversely proportional to its physical thickness between the two metallized surfaces. A mechanically vibrating crystal can be represented by an equivalent electrical circuit consisting of low Resistance, large Inductance and small Capacitance as shown below.

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