China Muscovite Mica is one of the rock forming minerals, it all has output in the three big rocks. During the metamorphic process of low grade regions can form Sericite Mica, when metamorphic degree is higher can be muscovite. The late crystallization of acid magma and the stage of pegmatite are produced by large number of muscovite. It can also be generated from the alteration process of high temperature to middle low temperature. the weathering of muscovite is broken into fine scales, which can be used not only in detrital sediments, but also a mineral composition of the mudstone.