Consider the following statements about Mica.
Which of the statements given above are correct?
Only 2, 3, 4
The term ‘mica’ covers a large group of rock-forming mineral. Owing to its excellent dielectric strength, low loss power factor and insulating properties, mica is one of the indispensable minerals used in electrical and electronics industry. Mica minerals occur in igneous, sedimentary and metamorphic rocks formed under different geological conditions.