Here have a few tens of kilohertz to hundreds of megahertz with two groups in SMD and DIP type package. The quartz crystal is a piezoelectric device, and will both produce a voltage across it when it is subjected to some mechanical distortion such as slight bending, or will distort slightly when a voltage is applied across it. Therefore applying regular voltage pulses will cause the crystal to bend, and the bending will in turn create voltage pulses in phase with the applied pulses, that will reinforce them and cause oscillation.