Mica is a mineral which combines in itself so many desirable properties for the qualifications imposed by the electrical industry. The most important property of Mica is its micaceous structure, that is, they have highly perfect basal cleavage which permits it to be split into sheets & films. Micas commonly occur as flakes, scales, or shreds. Sheet muscovite (white) mica is used in electronic insulators (mainly in vacuum tubes). Ground mica is used in paint, as joint cement, as a dusting agent, in well-drilling mud, and in plastics, roofing, rubber, and welding rods.