Slate

Slate Macro (~ 6 cm long and ~ 4 cm high)

Slate is a fine-grained, homogeneous, metamorphic rock derived from an original shale-type sedimentary rock composed of clay or volcanic ash through low grade regional metamorphism. The result is a foliated rock in which the foliation may not correspond to the original sedimentary layering. Look up slate in Wiktionary, the free dictionary. ... Slate Source: US Government File history Legend: (cur) = this is the current file, (del) = delete this old version, (rev) = revert to this old version. ... Slate Source: US Government File history Legend: (cur) = this is the current file, (del) = delete this old version, (rev) = revert to this old version. ... Image File history File links Metadata Size of this preview: 800 × 600 pixelsFull resolution (2272 × 1704 pixel, file size: 1. ... Image File history File links Metadata Size of this preview: 800 × 600 pixelsFull resolution (2272 × 1704 pixel, file size: 1. ... Quartzite, a form of metamorphic rock, from the Museum of Geology at University of Tartu collection. ... Shale Shale is a fine-grained sedimentary rock whose original constituents were clays or muds. ... Two types of sedimentary rock: limey shale overlaid by limestone. ... For other uses, see Clay (disambiguation). ... For other uses, see Volcano (disambiguation). ... Diamond Head, a well_known backdrop to Waikiki in Hawaii, is an ash cone that solidified into tuff Volcanic ash is the term for very fine rock and mineral particles less than 2 mm in diameter that are ejected from a volcanic vent. ... Metamorphism can be defined as the solid state recrystallisation of pre-existing rocks due to changes in heat and/or pressure and/or introduction of fluids i. ... Foliation is any penetrative planar fabric present in rocks. ...

Chemical composition

Slate is mainly composed of quartz and muscovite or illite, often along with biotite, chlorite, hematite, and pyrite along with, less frequently, apatite, graphite, kaolin, magnetite, tourmaline, or zircon as well as feldspar. Occasionally, as in the purple slates of North Wales, ferrous reduction spheres form around iron nuclei, leaving a light green spotted texture. These spheres are sometimes deformed by a subsequent applied stress field to ovoids, which appear as ellipses when viewed on a cleavage plane of the specimen. For other uses, see Quartz (disambiguation). ... Muscovite layer Muscovite, also known as potash mica, is a phyllosilicate mineral of aluminium and potassium with formula: KAl2(AlSi3O10)(F,OH)2. ... Structure of Illite mica - USGS. Illite is a non-expanding, clay-sized, micaceous mineral. ... A Biotite slice Biotite is a common phyllosilicate mineral that contains potassium, magnesium, iron and aluminium. ... Chlorite is a group of phyllosilicate minerals often classified as clays. ... Hematite, also spelled haematite, is the mineral form of Iron(III) oxide, (Fe2O3), one of several iron oxides. ... The mineral pyrite, or iron pyrite, is iron sulfide, FeS2. ... Apatite is a group of phosphate minerals, usually referring to hydroxylapatite, fluorapatite, and chlorapatite, named for high concentrations of OH-, F-, or Cl- ions, respectively, in the crystal. ... For other uses, see Graphite (disambiguation). ... Kaolin Kaolinite (Aluminium Silicate Hydroxide) Kaolinite is a mineral with the chemical composition Al2Si2O5(OH)4. ... // Headline text Magnetite is a ferrimagnetic mineral form of iron(II,III) oxide, with chemical formula Fe3O4, one of several iron oxides and a member of the spinel group. ... The tourmaline mineral group is chemically one of the most complicated groups of silicate minerals. ... Zircon is a mineral belonging to the group of nesosilicates. ... This article does not cite any references or sources. ... Splitting of the slate blocks with hammer and chisel to produce roofing slates requires great skill. ... In embryology, cleavage is the division of cells in the early embryo. ...

Uses of slate

Slate roof

Slate can be made into roofing slates, also called roofing shingles, installed by a slater. Slate has two lines of breakability: cleavage and grain. This makes it possible to split slate into thin sheets. Fine slate can also be used as a whetstone to hone knives. Due to its thermal stability and chemical inertness, slate has been used for laboratory bench tops and for billiard table tops. In 18th and 19th century schools, slate was extensively used for blackboards and individual writing slates for which chalk pencils were used. Because it was a good electrical insulator and was fireproof, it was used to construct early 20th century electric switchboards and relay controls for large electric motors. Stephen Kettle is notable as a British sculptor for his use of slate to create statues housed in the Science Museum in London. Image File history File links Metadata Size of this preview: 800 × 600 pixelsFull resolution (1280 × 960 pixel, file size: 582 KB, MIME type: image/jpeg) File historyClick on a date/time to view the file as it appeared at that time. ... Image File history File links Metadata Size of this preview: 800 × 600 pixelsFull resolution (1280 × 960 pixel, file size: 582 KB, MIME type: image/jpeg) File historyClick on a date/time to view the file as it appeared at that time. ... The roofs of Olomouc, Czech Republic. ... The largest (6000 m²) wooden shingle roof in Europe: Zakopane, Poland Roof shingles are a roof covering consisting of individual overlapping elements. ... A slater is another name for a woodlouse. ... A whetstone is a stone used for sharpening knives and other cutting tools and is usually made out of ceramic or a hard mineral such as quartz or novaculite. ... Categories: Sports stubs | Billiards ... A chalkboard, with multiple colors of chalk Blackboard Chalk A quadruple chalkboard at the Helsinki University of Technology A chalkboard or blackboard is a reusable writing surface on which text or drawings are made with chalk or other erasable markers. ... A writing slate is a piece of flat material used as a medium for writing. ... // Definition An Insulator is a material or object which resists the flow of heat (thermal insulators) or electric charge (electrical insulators). ... Fireproof is Christian band Pillars second full length album. ... An electric switchboard is a device that directs electricity from one source to another. ... Automotive style miniature relay A relay is an electrical switch that opens and closes under the control of another electrical circuit. ... For other kinds of motors, see motor. ... Stephen Kettle (born 12 July 1966, in Castle Bromwich, England) is an English sculptor who works exclusively with slate. ... Image:Science Museum bernoulli exhibit. ...

Slate tiles are often used for interior and exterior flooring or wall cladding. Tiles are installed and set on mortar and grouted along the edges. Chemical sealants are often used on tiles to improve durability and appearance, increase stain resistance, reduce efference, and increase or reduce surface smoothness. Tiles are often sold gauged, meaning that the back surface is ground for ease of installation.

Slate is often used as a decor in freshwater aquariums. Slate will not alter the chemistry of water (except in the slate containing felspar which may leech silicates into the water resulting in excess diatom growth in marine aquaria). When broken, slate produces a natural appearance while remaining relatively flat and can be easily stacked. Silicon glue adheres to slate, creating a non-toxic bond to secure it. It is also used in stairs and pathways for the same reasons.

Traditional Japanese Go equipment uses slate for the black pieces. Go is a strategic East Asian board game for two players. ...

Slate extraction

Exhibition Slate mine Fell

Historical Pit Vogelsberg 1 at Fell

Slate-producing regions include Cornwall (famously the town of Delabole), Wales and Cumbria (see Burlington Slate Quarries and Skiddaw Slate) in the United Kingdom (see slate industry in Wales), Liguria in northern Italy especially between the town of Lavagna (which means chalkboard in Italian) and Fontanabuona valley, Portugal especially around Valongo in the north of the country, Germany (Moselle River-region, Hunsrück, Eifel, Westerwald, Thuringia, north-Bavaria), Alta, Norway, Galicia, Brazil around Papagaio in Minas Gerais, the east coast of Newfoundland, the Slate Belt of Eastern Pennsylvania, and the Slate Valley of Vermont and New York. Granville, New York, of the Slate Valley claims to be the colored slate capital of the world. Image File history File links Download high-resolution version (844x568, 147 KB) Besucherbergwerk Fell - Grube Hoffnung File links The following pages on the English Wikipedia link to this file (pages on other projects are not listed): Slate Fell Exhibition Slate Mine ... Image File history File links Download high-resolution version (844x568, 147 KB) Besucherbergwerk Fell - Grube Hoffnung File links The following pages on the English Wikipedia link to this file (pages on other projects are not listed): Slate Fell Exhibition Slate Mine ... Slate mine Fell The Fell Exhibition Slate Mine is a former slate mine in Germany located about 20 km east from Trier (Germany) and about 60 km east from Luxembourg (city) (Luxembourg) next to the villages Fell and Thomm. ... Image File history File links Download high-resolution version (1049x727, 110 KB) Besucherbergwerk Fell - Grubenwenderweg (2) File links The following pages on the English Wikipedia link to this file (pages on other projects are not listed): Slate ... Image File history File links Download high-resolution version (1049x727, 110 KB) Besucherbergwerk Fell - Grubenwenderweg (2) File links The following pages on the English Wikipedia link to this file (pages on other projects are not listed): Slate ... For other uses, see Cornwall (disambiguation). ... Delabole, a village in North Cornwall, England, UK. It is the third highest village in Cornwall, the two highest are also in the North Cornwall district. ... This article is about the country. ... Burlington Slate Quarries are located near Kirkby in Furness in SW Cumbria,England. ... Skiddaw slate is an early Ordovician compressed sedimentary rock, as first identified on the slopes of Skiddaw in the English Lake District. ... Splitting of the slate blocks with hammer and chisel to produce roofing slates requires great skill. ... Liguria is a coastal region of north-western Italy, the third smallest of the Italian regions. ... Coat of Arms Valongo (pron. ... This article is about the river in France, Luxembourg & Germany. ... A typical view of the Hunsrück countryside. ... Not to be confused with Eiffel Tower. ... The Westerwald is a mountain chain in Germany. ... The Free State of Thuringia (German: Freistaat Thüringen) is located in central Germany and is considered one of the smaller of Germanys sixteen Bundesländer (federal states), with an area of 16,200 km² and 2. ... For other uses, see Bavaria (disambiguation). ... County Finnmark District Municipality NO-2012 Administrative centre Alta Mayor (2003) Geir Ove Bakken (Ap) Official language form BokmÃ¥l Area  - Total  - Land  - Percentage Ranked 7 3,849 km² 3,651 km² 1. ... Galicia (Spain) - Wikipedia, the free encyclopedia /**/ @import /skins-1. ... Flag of Minas Gerais See other Brazilian States Capital Belo Horizonte Largest City Belo Horizonte Area 586,528. ... Newfoundland —   IPA: [nuw fÉ™n lænd] (French: , Irish: ) is a large island off the east coast of North America, and the most populous part of the Canadian province of Newfoundland and Labrador. ... Capital Harrisburg Largest city Philadelphia Area  Ranked 33rd  - Total 46,055 sq mi (119,283 km²)  - Width 280 miles (455 km)  - Length 160 miles (255 km)  - % water 2. ... Official language(s) None Capital Montpelier Largest city Burlington Area  Ranked 45th  - Total 9,620 sq mi (24,923 km²)  - Width 80 miles (130 km)  - Length 160 miles (260 km)  - % water 3. ... This article is about the state. ... Granville is a town located in Washington County, New York. ...

There was also a major slating operation in Monson, Maine during the late 19th and early 20th centuries. The slate found in Monson is usually a dark purple to blackish color, and many local structures are still roofed with slate tiles. Of many operations there is only one business currently operating. The output was so great it formed a train route throughout the woods of Monson and as many as 18 quarries were made. St. Patricks's Cathedral in New York's roof was made from roofing slate from Monson, as well as the Headstone of John F. Kennedy. Monson is a town located in Piscataquis County, Maine. ... The Monson Railroad was a two foot gauge railroad which operated between Monson Junction on the Bangor and Aroostook Railroad and Monson, Maine. ... St. ...

Slate is also found in the Arctic and was used by the Inuit to make the blades for ulus. China has vast slate deposits; in recent years its export of finished and unfinished slate has increased. The red line indicates the 10°C isotherm in July, commonly used to define the Arctic region border Satellite image of the Arctic surface The Arctic is the region around the Earths North Pole, opposite the Antarctic region around the South Pole. ... For other uses, see Inuit (disambiguation). ... An ulu in the western Arctic style An ulu (Inuktitut syllabics: ᐅᓗ) is an Inuit womans all-purpose knife. ...

See also

• List of rock types
• Tile
• Welsh Slate Museum
• Exhibition slate mine fell
• Slate industry in Wales

This page is intended as a list of all rock types. ... Mission, or barrel, roof tiles A tile is a manufactured piece of hard-wearing material such as ceramic, stone, porcelain, metal or even glass. ... Entrance to museum The Welsh Slate Museum is located at Gilfach Ddu in the 19th century workshops of the now disused Dinorwic slate quarry, within the Padarn Country Park, Llanberis. ... Slate mine Fell The Fell Exhibition Slate Mine is a former slate mine in Germany located about 20 km east from Trier (Germany) and about 60 km east from Luxembourg (city) (Luxembourg) next to the villages Fell and Thomm. ... Splitting of the slate blocks with hammer and chisel to produce roofing slates requires great skill. ...

External links

• AditNow - Photographic database of mines
• History of the Welsh slate industry
• Slatesite — bilingual site focusing on Welsh slate
• Step-by-step guide to how Roofing Slate is produced at Greenstone Slate
• John T F Turner - A Familiar Description of the Old Delabole Slate Quarries, 1864
• History of the Scottish Slate Islands