Sericite


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sericite

[′ser·ə‚sīt]
(mineralogy)
A white, fine-grained potassium mica, usually muscovite in composition, having a silky luster and found as small flakes in various metamorphic rocks.

Sericite

 

a variety of white mica, usually muscovite, KAl2[AlSi3O10](OH)2, less commonly, paragonite, NaAl2[AlSi3O10](OH)2. Sericite often contains less potassium (sodium) and more water, SiO2, and MgO and approaches the composition of hydromicas, such as illite and phengite. It is usually encountered as small flakes and scales with a silky luster. As a secondary mineral, sericite is very common in hydrothermally altered igneous and metamorphic rocks, in sericite schists, and in the selvages of ore bodies, where it occurs with quartz, carbonates, chlorite, sulfides, barite, talc, and, less commonly, with fluorite and tourmaline.

References in periodicals archive ?
Within the deeper diorite unit, some intense sericite alteration was observed with arsenopyrite, pyrite and pyrrhotite, generally as selvedges to quartz veins.
In HDPE filled with sericite, mica, kaolin, or diatomite; however, a distinct CI gradient was noted on the sections.
The deep drill hole is currently 1956 meters below surface and has intersected 123 meters (core length) of permissive schist units which are characterized by significant alumina- and potassium-rich minerals (white feldspar, sillimanite, garnet, sericite and biotite), variable amounts of pyrite and pyrrhotite (trace to 5%) and local sphalerite and galena (trace to 3%).
A total of 90 samples from the silica sericite alteration zones have been submitted for assay.
The eleven holes will be drilled at four distinct target areas along the projected extension of a gold bearing Sericite Schist trend as determined by Rubicon Minerals Corp.
The study Sericite mica (CAS 1332-58-7) Market Research Report 2012 presents an overview of the Sericite mica market globally and regionally by contemplating and analyzing its parameters.
The volcanic rocks have undergone sericite alteration nearer to the surface and potassic alteration at depth.
1) Daye Gold Mine owns 25% of the sericite recovery operations from tailings located on the Daye mine site.
22 meters of sulphide rich structural sericite breccia respectively.
Recent work on the 18 claim (450 hectares) copper property known has the "Shaylee" property have uncovered some very impressive native copper along with globs of massive chalcocite in quartz veins hosted by sericite schist derived from felsic volcanic & epiclastic sediment protholiths.
The porphyries are extensively altered to sericite schists which contain abundant pyrite and anomalous amounts of copper and molybdenum sulfides.