
Sericite is a fine grained mica, similar to 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 she...
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http://en.wikipedia.org/wiki/Sericite

• (n.) A kind of muscovite occuring in silky scales having a fibrous structure. It is characteristic of sericite schist.
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http://thinkexist.com/dictionary/meaning/sericite/

fine-grained variety of either of the silicate minerals muscovite and paragonite (qq.v.).[2 related articles]
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http://www.britannica.com/eb/a-z/s/67
Ser'i·cite noun [ Latin
sericus silken.]
(Min.) A kind of muscovite occuring in silky scales having a fibrous structure. It is characteristic of sericite schist.
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http://www.encyclo.co.uk/webster/S/72

sericite A fine grained mica (thought to be derived from the Latin word micare, 'to shine', in reference to the brilliant appearance of this mineral). The name sericite comes from the Latin sericus, 'silken', referring to the to the silky sheen of rocks with abundant sericite.
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http://www.wordinfo.info/words/index/info/view_unit/1943/
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