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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.
Additional recommended knowledge
The name comes from the Latin sericus, meaning "silken" in reference to the location from which silk was first utilized, which in turn refers to the silky sheen of rocks with abundant sericite.
|This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Sericite". A list of authors is available in Wikipedia.|