MineralogySericite is very fine, ragged grains and aggregates of white or colourless micas, typically made of muscovite, illite, or paragonite.
Sericite is produced by the alteration 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.