slate

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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 ?
As a manufacturer and distributer of proven mobile computing solutions since 2003, the company's line of Tablet PCs, including the Sahara Slate PC, has been widely used in Healthcare, Hospitality, Government and Manufacturing both as TabletKiosk branded and OEM/Private Label deployments.
We created our Slate PCs with a focus on beautiful design, powerful performance and ease of use, attributes that our customers have come to expect in their Samsung computing experience.
Samsung representatives concluded that the Slate PC will be available across retail outlets in the UAE at a starting price of AED4999 beginning today.
This is our sweet spot -- and we are targeting the professional and government computing markets with a new slate PC that draws on more than twenty years experience in building mobile computers for enterprise use," he added.
In a subsequent telephone interview shortly after the event, he told Khaleej Times that the Slate PC Series 7 is different from the Seoul-based company's other hit, the Galaxy Tab, since the latter is "purely for media consumption".
We congratulate Samsung on the certification of the SLATE PC Series 7.
The new Sahara Slate PC i575 and i535 Tablet PCs offer many upgraded features over the existing models that make them even more valuable for business use, including:
The Samsung Series 7 Slate PC was designed for on-the-go users who need a slim, lightweight computer but can't afford to sacrifice true PC functionality," said Scott Ledterman, director of mobile PC marketing at Samsung Enterprise Business Division.
IDCRP's current electronic data capture (EDC) solution, deployed in Afghanistan, Kenya and Djibouti, incorporates the Sahara Slate PC i500 running Mi-Forms mobile-forms technology from Mi-Co to create a comprehensive, all in one data collection unit.
9 million iPads are expected to be shipped this year, while the annual shipments of such touch-control slate PCs made by Apple are forecast to be 36.
USA TODAY is now available on major platforms and devices including Windows Phone, iOS (iPhone, iPad, iPod Touch), Android (phones and tablets), Chrome Web Store, Google TV, Windows-based slate PCs and Intel's AppUp store for netbook PCs.
MSI), for example, each unveiled four slate PC models at 2010 Computex Taipei (Taipei International Information Technology Show) in early June.