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Sericite is a fine grained mica, either muscovite, illite, or paragonite. Sericite is a common alteration mineral of orthoclase or plagioclase feldspars in areas that have been subjected to hydrothermal alteration typically associated with copper, tin, or other hydrothermal ore deposits. Sericite also occurs as the fine mica that gives the sheen to phyllite and schistose metamorphic rocks.
Sericite are extensively used in electric welding rod, rubber, plastic, anti-fire coating, paint, ceramic, heat preservation, cosmetic, pigments, paper, textile, metallurgy, and many other industries.