The Mica capacitor uses mica as the dielectric material. Mica is a transparent mineral, that is easy to split into thin plates. The mica plates is given silver electrodes and than stacked to get the wanted capacitance. It has exelent characteristics like low loss and high stability and can compete with the best plastics. the downsides is high price and large size. Because of this mica has been replaced by plastic film capacitors in many applications. But mica capacitors is still much used in high frequency circuits due to high temperature and frequency stability.

Mica capacitors are available in the range 1pF to 250nF and for voltages up to about 50kV.