mica schist


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mica schist

[′mī·kə ‚shist]
(petrology)
A schist which is composed essentially of mica and quartz and whose characteristic foliation is mainly due to the parallel orientation of the mica flakes.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
References in periodicals archive ?
domain-I dominantly comprises quartz mica schist and garnet bearing quartz mica schist (Class D), domain-II contains quartz biotite schist and garnet mica schist and marble (Class C), domain-III holds calcareous schist and marble (Class A and B), domain-IV covers Garnet mica schist (Class D), domain-V contains quartzite and quartz mica schist (Class E and F) and domain VI which dominantly have Garnet mica schist and calcareous schist (Class A and B).
Since the failures in quartz mica schist occurred in the weathered zones, the characteristics of these weathered earth materials were studied in order to interpret the features of the morphological zones.
The Saint Barthelemy massif is composed of three major units, in places separated by unconformities: a basal gneiss unit, a migmatite unit overlain by a mica schist envelope, and finally a weakly metamorphosed Paleozoic succession.
The Bishop copper prospect, the Bishop manganese mine and other nearby occurrences of iron and manganese ores are located in the Mount Athos Formation, which contains beds of quartzite, conglomerate, calcareous quartzite, marble, siliceous mica schist and ferruginous mica schist (Espenshade 1954).
The Quartz Mica Schist unit in chainage 2275-3600m was observed generally light grey to grey in colour, moderately hard, and weathered at the surface.
The rock mass consists of: mica schists, calcareous garnet-mica schists and limestones with thin layers of amphibolites and quartzities.
The real section showed that the upper drill hole passed through mica schist with rare interbeds of biotite gneiss down to a depth of 1310 m (Kukkonen et al., 2009).
[sup.226]Ra activity concentrations in granites from Szklarska Poreba (Karkonosze granite) vary in the wide range from 15 to 119 Bq x [kg.sup.-1] whereas in aplite and in mica schist from Szklarska Poreba [sup.226]Ra activity concentrations equal 66 [+ or -] 6 Bq x [kg.sup.-1] and 54 [+ or -] 9 Bq x [kg.sup.-1] respectively (Przylibski, 2004).
The extensive Orlice-Snieznik Complex is built by orthogneisses, metagranites and migmatites with mica schists, paragneisses and phyllonites of the Stronie Group of the Lower Paleozoic and Upper Proterozoic age.
The basement horsts consist of the Archaean Xingu Complex which is mainly composed of gneisses and migmatites with intercalated amphibolites and mica schists. During the early Proterozoic, acid to basic metavolcanics and detrital chemical sediments (iron formations) of the Alto Paranaita Formation were deposited over the basement.