slate

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Related to slaty: slate, salty

slate,

fine-grained 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.
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 formed when sedimentary rocks such as shaleshale,
sedimentary rock formed by the consolidation of mud or clay, having the property of splitting into thin layers parallel to its bedding planes. Shale tends to be fissile, i.e., it tends to split along planar surfaces between the layers of stratified rock.
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 are metamorphosed by great pressure. Slate splits into perfectly cleaved, broad thin layers; this characteristically regular and planar cleavage is called slaty cleavage. In the formation of slate, pressure causes the flaky minerals within the sedimentary rock, such as mica, clay, and chlorite, to be reoriented; the flat faces of the minerals lie at right angles to the source of the pressure, and the planes of easy cleavage are also at right angles to the source of the pressure. The rock is not necessarily compressed in the same direction as the sedimentary layers were originally laid down, and because the compression crumples and deforms the original sedimentary layers, the planes of slaty cleavage usually cut through the old bedding planes. Slate is intermediate in hardness between mica schistsschist
, metamorphic rock 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
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 and shale; the better grades are used for roofing. Its characteristic color is gray-blue. Slate is mined in Maine, Vermont, Pennsylvania, Georgia, Lake Superior, and the Rocky Mts.

slate

A hard, brittle metamorphic rock characterized by good cleavage along parallel planes; used as cut stone in thin sheets for flooring, roofing, and panels, and in granular form as surfacing on composition roofing.
See also: Stone

Slate

 

a schistous, sedimentary rock used for roofing. It consists of argillaceous minerals (for the most part, various hydromicas and chlorite) whose particles are usually arranged in strictly parallel lines. This structure gives slate a sharply defined schistosity, that is, the capacity for cleavage into thin lamina. Slate does not fall apart in water and has the characteristics of geosynclinal sediments. It is formed by the compaction of clays and their partial recrystallization under pressure at considerable depths as well as by the effect of dynamic metamorphism. When it undergoes further change, it becomes a phyllte or a chlorite slate.

The largest known deposits of slate in the USSR are located in the Caucasus and the Urals. Slate is used as roofing material; in the production of low-voltage switchboards, knife switches, and other apparatus in the electrical industry; and in the production of certain structural components (panels for the interior facing of rooms). Slate is also used in a crushed, roasted, and aerated form as filler for certain types of concrete, large wall blocks, and for cladding ruberoid(roof-sheeting material).

V. P. PETROV

slate

[slāt]
(petrology)
A group name for various very-fine-grained rocks derived from mudstone, siltstone, and other clayey sediment as a result of low-degree regional metamorphism; characterized by perfect fissility or slaty cleavage which is a regular or perfect planar schistosity.

slate

A hard, brittle metamorphic rock consisting mainly of clay minerals, characterized by good cleavage along parallel planes; used extensively as dimension stone in thin sheets for flooring, roofing, panels (both decorative and electrical), and chalkboard, and in granular form as surfacing on composition roofing.

slate

1. 
a. a compact fine-grained metamorphic rock formed by the effects of heat and pressure on shale. It can be split into thin layers along natural cleavage planes and is used as a roofing and paving material
b. (as modifier): a slate tile
2. a dark grey colour, often with a purplish or bluish tinge
3. Chiefly US and Canadian a list of candidates in an election
4. Films
a. the reference information written on a clapperboard
b. Informal the clapperboard itself

slate

Another name for a tablet computer. In 2010, HP introduced tablets under the Slate brand. See Tablet PC and tablet computer.
References in periodicals archive ?
Shear zones, manifested by the presence of slaty cleavage typically develop in strike-slip zones and they often develop also in sediments overlying active strike-slip discontinuity in their central, axial part (e.
Forest ecologist Utami Setiorini had worked with him on a study of Indonesia's great slaty woodpecker, so she joined the search party too.
But a trogon's natural instinct is to sit on a branch, deep inside the green-leafed tree with the berries & hold perfectly still & upright - its long slaty tail wavering ever so slightly in the breeze.
Robbie didn't answer; he merely turned rudely and started walking on along the slaty shore, setting a brisk pace.
If you have trouble locating any of the necessary materials or need technical help, write KELCOT, 14786 Slaty Gap Road, West Fork, AR 72274; or call 501/839-8221.
Development of Low-Cost Functional Geopolymeric Materials (Mazen Alshaaer, Faten Slaty, Hani Khoury, Hubert Rahier, and Jan Wastiels).
Abson R and Lawrence RE (2003) Monitoring the use of the Slaty Creek wildlife underpass, Calder Freeway, Black Forest, Macedon, Victoria, Australia.
Consisting of a 60m "ladder" of criss-crossing logs pinned into the banks of Slaty Sike, a tributary of the burn, the aim is to slow the flow of water during periods of intense rainfall, trapping sediments and rocks just like the marbles in a game of Kerplunk.
About 3 m above the contact, the Chain Rock member displays bedding that is deformed into a tight fold that produces strongly curved intersection lineations on the regional slaty cleavage, showing that the cleavage transects both limbs of the fold (Fig.
These structures fold an S1 slaty cleavage, which forms an angle lower than 10[degrees] with bedding.
5lb from the Saltpans at Amble and Slaty Gut, Amble (not Whitley Bay).
The dragonfly appears to be a female slaty skimmer; and was identified by Thomas Donnelly, an odonate expert at SUNY Binghamton.