Beta‐quartz, the high‐temperature form of quartz, which exists from 573°C to 850°C, is examined for use as a piezoelectric device. The formulas for the piezoelectric constants and elastic constants are given for rotated reference frames. By suitably rotating the crystal plate, it is possible to piezoelectrically excite lengthwise extensional, face shear and thickness shear modes of vibration. Thickness extensional modes cannot be excited. It is thus possible to make both high‐ and low‐frequency piezoelectric resonators and transducers out of β‐quartz for very high temperature applications.