schist


Also found in: Dictionary, Thesaurus, Wikipedia.
Related to schist: Mica schist, amphibolite

schist

(shĭst), metamorphic rockrock,
aggregation of solid matter composed of one or more of the minerals forming the earth's crust. The scientific study of rocks is called petrology. Rocks are commonly divided, according to their origin, into three major classes—igneous, sedimentary, and metamorphic.
..... Click the link for more information.
 having a foliated, or plated, structure called schistosity in which the component flaky minerals are visible to the naked eye. Schists are distinguished from the other foliated rocks, slates and gneisses, by the size of their mineral crystals; these are larger than those of slates, being visible to the naked eye, but smaller than those of gneisses, which are coarsely foliated rocks as opposed to finely foliated, or schistose, rocks. As contrasted with the folia of slates, the folia of schists are rough-surfaced and irregular. Schists split readily along their planes of schistosity, like slates along cleavage lines. Like other foliated rocks, schists owe their origin to the metamorphism of preexisting rocks. The commonest of the schists is mica schist, the essential minerals of which are quartzquartz,
one of the commonest of all rock-forming minerals and one of the most important constituents of the earth's crust. Chemically, it is silicon dioxide, SiO2.
..... Click the link for more information.
 and micamica
, general term for a large group of minerals, hydrous silicates of aluminum and potassium, often containing magnesium, ferrous iron, ferric iron, sodium, and lithium and more rarely containing barium, chromium, and fluorine.
..... Click the link for more information.
 (biotite or muscovite). Other schists are hornblende schist, talc schist, chlorite schist, and graphite schists. Schists are abundant in the Precambrian (Archean and Proterozoic) rocks.
The Columbia Electronic Encyclopedia™ Copyright © 2013, Columbia University Press. Licensed from Columbia University Press. All rights reserved. www.cc.columbia.edu/cu/cup/

schist

[shist]
(geology)
A large group of coarse-grained metamorphic rocks which readily split into thin plates or slabs as a result of the alignment of lamellar or prismatic minerals.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.

schist

A rock, the constituent minerals of which have assumed a position in more or less closely parallel layers or folia; due to metamorphic action; used principally for flagging.
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.

schist

any metamorphic rock that can be split into thin layers because its micaceous minerals have become aligned in thin parallel bands
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005
References in periodicals archive ?
However, such a trend did not occur for soils formed from schist, for which SOC concentrations were not affected by altitude.
As shown schematically in Figure 1(a), the green schist stratum and coal seam stratum are assembled by placing the elementary slabs in layers with perfectly mated interfaces.
Schist constitutes the same predominant substratum in the sampling area.
Caption: The kitchen has textural schist granite countertops.
The metamorphic units comprise garnet-glaucophane schist (lepi-doporphyroblastic texture), epidote-chlorite schist (lepidoblastic texture), garnet-lawsonite-glaucophane schist and epidotite (nematoblastic texture) (Fig.
It's great fun to try to figure out rock identities even as the water-polished pebbles afford an endless variety of gneisses, granitic rocks, schists, shales, black mudstones, and white quartzite.
Generally black soils have less sand (Asio et al., 2006).The basalt derived Bidar soil showed higher magnitude of swelling and shrinkage as indicated by high COLE value (0.33) than the limestone derived Shahabad soil and schist derived Hira soil.
In particular, R1-line peak positions from synthetic emeralds occur at shortest wavelength, peaks from non-schist origin natural emeralds occur at similar or longer wavelengths, and peaks from schist origin emeralds occur at longest wavelengths.
Moving to the south-west of France and the PIERRICK HARANG WINE CUVEE BALTHAZAR SYRAH 2011, PAY D'OC (PS11.49, Waitrose, Alexander Wines) takes advantage of the brown schist soils resulting in a perfumed nose of violets and sweet blackberry fruit with a touch of pencil shavings at the edges.