Explanation:

Mica is widely distributed and occurs in igneous, metamorphic and sedimentary regimes. Large crystals of mica used for various applications are typically mined from granitic pegmatites. It has superior electrical properties as an insulator and as a dielectric, and can support an electrostatic field while dissipating minimal energy in the form of heat; it can be split very thin while maintaining its electrical properties, has a high dielectric breakdown, is thermally stable to 500 °C  and is resistant to corona discharge.