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Related to Schists: Mica schist, Gneisses
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  • noun

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any metamorphic rock that can be split into thin layers

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The Bugalagrande Group is composed of chlorite and actinolite schists interlayered with pelitic schists and quartzites, while El Rosario Complex consists of amphibolites and garnet amphibolites with weak- to well-developed foliation.
All of the igneous rocks contain less than 20% strained quartz while metamorphic and sedimentary rocks contain quartzite, schists, gneisses and dolomitic chert with more than 20% deleterious minerals and renders this aggregate reactive with an ASR potential.
Schists are often dark in color and sparkle in the sun.
In the present study, Hira black soil represents schists of Dharwarian formation, Bidar black soil represents basalts of Deccan trap formation and Shahabad soil represents the limestones of Bhima formation.
The mineralised zone is dominated by several close-banded iron, amphibole-magnetite schists and talc magnetite schists bearing ore bodies that have a west-northwest strike and a near vertical dip.
The schists and quartz-schists (Esquistos Grises de Punta Claditas and Esquistos Grises de la Gruta, after Rebolledo and Charrier, 1994) consist of quartz, white-mica, chlorite, albite and garnet (Grt1 [+ or -] Grt2), with tourmaline, epidote, apatite, zircon, titanite, ilmenite and rutile as accessory minerals.
It consists of green schists parasitized by loess deposits where the rivers deepened and branched a lot, reaching to Proterozoic green schist, emphasizing the current geomorphological processes.
The northern part lies in a hilly area where the geologic substrate is pelitic schist of the Precambrian "flyschoid series" (Orapu schist of Armina series [9, 10]).
The lithology of the area consists of greenschists, mica schists, quartzites, hornblende schists, amphibolites, garnet-amphibolites, serpentinites and porphyritic hypabyssal rocks with andesitic to dacitic composition (Figure 1).
Prominent rock units include granite gneiss, migmatites, schist/ quartz schist, porphyritic granite, fine-medium grained granite and charnockite.
Starting at a depth of 1655 m, schists alternate mainly with layers of pegmatite granite and biotite gneiss.
The majority of the schist identified was of the chlorite zone of the greenschist facies, although some glaucophanic greenschists and schists of the prehnite-pumpellyite facies also occur.
In 1980 graphitic schists were identified within altered dolomite units during exploration for uranium.
In Wadi Sikait, these rocks are represented by phlogopite and actinolite schists in the schist melange.
In the zone amphibolites, gneisses, tonalites and mica schists alternate frequently.