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|Secondary||biotite, chlorite, hematite, pyrite|
Slate is a fine-grained, foliated, homogeneous metamorphic rock derived from an original shale-type sedimentary rock composed of clay or volcanic ash through low-grade regional metamorphism. It is the finest grained foliated metamorphic rock. Foliation may not correspond to the original sedimentary layering, but instead is in planes perpendicular to the direction of metamorphic compression.
The very strong foliation is called "slaty cleavage". It is caused by strong compression causing fine grained clay flakes to regrow in planes perpendicular to the compression. When expertly "cut" by striking parallel to the foliation, with a specialized tool in the quarry, many slates will form smooth flat sheets of stone which have long been used for roofing and floor tiles and other purposes. Slate is frequently grey in color, especially when seen, en masse, covering roofs. However, slate occurs in a variety of colors even from a single locality; for example, slate from North Wales can be found in many shades of grey, from pale to dark, and may also be purple, green or cyan. Slate is not to be confused with shale, from which it may be formed, or schist. Ninety percent of Europe's natural slate used for roofing originates from Spain.
The word "slate" is also used for certain types of object made from slate rock. It may mean a single roofing tile made of slate, or a writing slate. This was traditionally a small smooth piece of the rock, often framed in wood, used with chalk as a notepad or noticeboard, and especially for recording charges in pubs and inns. The phrases "clean slate" and "blank slate" come from this usage.
Historical mining terminology
Before the mid-19th century, the terms slate, shale and schist were not sharply distinguished. In the context of underground coal mining in the United States, the term slate was commonly used to refer to shale well into the 20th century. For example, roof slate referred to shale above a coal seam, and draw slate referred to shale that fell from the mine roof as the coal was removed.
Slate is mainly composed of the minerals quartz and muscovite or illite, often along with biotite, chlorite, hematite, and pyrite and, less frequently apatite, graphite, kaolinite, 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.
Slate in buildings
Slate can be made into roofing slates, which are installed by a slater and are a type of roof shingle, or more specifically a type of roof tile. Slate has two lines of breakability: cleavage and grain, which make it possible to split the stone into thin sheets. When broken, slate retains a natural appearance while remaining relatively flat and easy to stack.
Slate is particularly suitable as a roofing material as it has an extremely low water absorption index, less than 0.4%, which makes it resistant to frost damage.
Slate roof tiles are usually fixed either with nails, or with hooks as is common with Spanish slate. In the UK, fixing is typically with double nails onto timber battens (England and Wales) or nailed directly onto timber sarking boards (Scotland and Northern Ireland). Nails were traditionally of copper, although there are modern alloy and stainless steel alternatives. Both these methods, if used properly, provide a long-lasting weathertight roof with a lifespan of around 80–100 years.
Some mainland European slate suppliers suggest that using hook fixing means that:
- Areas of weakness on the tile are fewer since no holes have to be drilled
- Roofing features such as valleys and domes are easier to create since narrow tiles can be used
- Hook fixing is particularly suitable in regions subject to severe weather conditions since there is a greater resistance to wind uplift as the lower edge of the slate is secured.
The metal hooks are, however, visible and may be unsuitable for historic properties.
Slate tiles are often used for interior and exterior flooring, stairs, walkways and 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 efflorescence, and increase or reduce surface smoothness. Tiles are often sold gauged, meaning that the back surface is ground for ease of installation. Slate flooring can be slippery when used in external locations subject to rain. Slate tiles were used in 19th century UK building construction (apart from roofs) and in slate quarrying areas such as Blaenau Ffestiniog & Bethesda, Wales there are still many buildings wholly constructed of slate. Slates can also be set into walls to provide a rudimentary damp-proof membrane. Small offcuts are used as shims to level floor joists. In areas where slate is plentiful it is also used in pieces of various sizes for building walls and hedges, sometimes combined with other kinds of stone. In modern homes slate is often used as table coasters.
Slate tile sizes
There are a number of different sizes that slate tiles are cut into when produced traditionally. These are Countesses, Duchesses, Princesses, Narrow Countesses, Wide Ladies, Broad Ladies, Narrow Ladies, 14 x 10's and Drains (various sizes). Each slate is squared and then using a traditional measuring stick scored across the surface so as to get the largest size slate from that piece - the slate was then dressed (Slate Dressing) to these marks.
Because it is a good electrical insulator and fireproof, it was used to construct early-20th century electric switchboards and relay controls for large electric motors. 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 slate or chalk pencils were used.
Slate-producing regions in Europe include Wales (with a Museum at Llanberis), Cornwall (famously the village of Delabole), Cumbria (see Burlington Slate Quarries, Honister Slate Mine and Skiddaw Slate) in the United Kingdom; parts of France (Anjou, Loire Valley, Ardennes, Brittany, Savoie); Belgium (Ardennes); 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; Spain, particularly Galicia; Germany's Moselle River-region, Hunsrück, Eifel, Westerwald, Thuringia and north Bavaria (with a former mine open as a museum at Fell); and Alta, Norway (actually schist, not a true slate). Some of the slate from Wales and Cumbria is colored slate (non-blue): purple and formerly green in Wales and green in Cumbria. China has vast slate deposits; in recent years its export of finished and unfinished slate has increased. It has slate in various colors.
In the Americas
Slate is abundant in Brazil, the world's second-biggest producer of slate, around Papagaios in Minas Gerais, which extracts 95 percent of Brazil's slate. However, not all "slate" products from Brazil are entitled to bear the CE mark.
Slate is produced on the east coast of Newfoundland, in Eastern Pennsylvania, Buckingham County, Virginia, and the Slate Valley of Vermont and New York, where colored slate is mined in the Granville, New York area. Pennsylvania slate is widely used in the manufacture of turkey calls used for hunting turkeys in the U.S. The tones produced from the slate (when scratched with various species of wood strikers) imitates almost exactly the calls of all 4 species of turkey in North America: Eastern Wild Turkey, Rio Grande, Osceola and Merriam's.
A major slating operation existed in Monson, Maine during the late 19th and early 20th centuries, where the slate is usually dark purple to blackish, and many local structures are still roofed with slate tiles. The roof of St. Patrick's Cathedral was made of Monson slate, as is the headstone of John F. Kennedy.
- Essentials of Geology, 3rd Ed, Stephen Marshak
- European Association of Mining Industries website retrieved on 26 January 2010
- R. W. Raymond, Slate, A Glossary of Mining and Metallurgical Terms, American Institute of Mining Engineers, 1881; page 78.
- Albert H. Fay, Slate, A Glossary of the Mining and Mineral Industry, United States Bureau of Mines, 1920; page 622.
- J. Marvin Weller, ed.,Supplement to the Glossary of Geology and Related Sciences, American Geological Institute, 1960; page 18.
- Galician and Spanish Slate website "Hook Fixing". Retrieved on 26 January 2010
- National Slate Museum, Llanberis
- Fundación Centro Tecnológico de la Pizarra. Report into the "Technical properties of Bambui Slate from the State of Minas Gerais (Brazil) to ascertain its compliance with the Standard EN12326". Brazilian Slate Report, retrieved on 27 January 2010
- Granville: Facts accessed 23 March 2011
- BBC Video: David Attenborough: Lost Worlds, Vanished Lives
- Page, William (ed.) (1906). The Victoria History of the County of Cornwall; vol. I. (Chapter on quarries.) Westminster: Constable.
- Hudson, Kenneth (1972). Building Materials; "Chapter 2: Stone and Slate". London: Longman, pp. 14–27. ISBN 0-582-12791-2.
|Wikimedia Commons has media related to Slate.|
- AditNow—Photographic database of mines
- John T F Turner - A Familiar Description of the Old Delabole Slate Quarries, 1864
- Granville Slate Museum
- Hower’s Lightning Slate Reckoner (1884/1904), by F. M. Hower, Cherryville, Penn., on Stone Quarries and Beyond (PDF/18.95 MB)