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Scoria. 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.
The scoria deposits also contain abundant mantle xenoliths of peridotite. [4] Mt Quincan, viewed from the southeast, showing the southern quarry with the main scoria cone behind it and the low-lying crater to the east. Quincan, a type of Scoria, is mined from the south west quadrant of the mountain. [5]
Royal Society Volcano, Antarctica; Cerro Volcánico, Argentina; Mount Mayabobo, Philippines; Bombalai Hill (Sabah, Malaysia); Geghama mountains, Armenia; Chaîne des Puys, France (a chain of volcanoes including cinder cones)
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.
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The geographical Rochfort Crater is the crater of the central scoria cone, [3] which is also associated with west and east ejecta rings. [ 6 ] To the east of the complex is the Mangawhero River and to its north forested land rises rapidly to the plateau like peak of Raetihi on the slopes of Mount Ruapehu whose central edifice is about 20 km (12 ...