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Scoria or cinder is a pyroclastic, highly vesicular, dark-colored volcanic rock formed by ejection from a volcano as a molten blob and cooled in the air to form discrete grains called clasts. [ 1 ] [ 2 ] It is typically dark in color (brown, black or purplish-red), and basaltic or andesitic in composition.
Scoria bricks [a] is a type of blue-grey brick made from slag, originally manufactured from the waste of the steelworks of Teesside, common across the North-East of England. [ 3 ] [ 4 ] The bricks were also exported around the world and can be found in Canada, West Indies , Netherlands, Belgium, United States, India and South America.
A cinder cone (or scoria cone [1]) is a steep conical hill of loose pyroclastic fragments, such as volcanic clinkers, volcanic ash, or scoria that has been built around a volcanic vent. [ 2 ] [ 3 ] The pyroclastic fragments are formed by explosive eruptions or lava fountains from a single, typically cylindrical, vent.
Scoria cones are small volcanoes with relatively steep sides, usually formed as the result of a single major episode of volcanic activity. Lava lakes often form in the centre of scoria cones; if the lava in such a lake breaches the side of the cone, the result is a breached scoria cone, such as Mount Elephant. [1]
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Eldborg í Bláfjöllum is a scoria cone, part of a group of three such small volcanoes. [2] The crater group as well as the impressive lava channels and tubes nearby are products of eruptions within the Brennisteinsfjöll volcanic system around the year 1000.
A red scoria pukao on the head of a moai at Ahu Tahai, made using rock from Puna Pau. Maunga Puna Pau is a small crater or cinder cone and prehistoric quarry on the outskirts of Hanga Roa in the south west of Easter Island (a Chilean island in the Pacific Ocean). Puna Pau gives its name to one of the seven regions of the Rapa Nui National Park.
Scoria is a type of vesicular volcanic rock. Scoria may also refer to: Scoria (wrestler), Mexican wrestler, also known as Escoria; Elvis Scoria (born 1971), Croatian football player; Slag, or other waste from iron production Scoria brick, a kind of brick made of iron slag from North-East England; Scoria, a synonym of the moth genus Siona