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Arkose (/ ˈ ɑːr k oʊ s,-k oʊ z /) or arkosic sandstone [1] is a detrital sedimentary rock, specifically a type of sandstone containing at least 25% feldspar. [2] [3] Arkosic sand is sand that is similarly rich in feldspar, and thus the potential precursor of arkose.
Arkose is a type of sedimentary rock characterized by its high mineral content of feldspar, particularly orthoclase. It is often considered a type of sandstone, but its distinctiveness lies in the abundance of feldspar grains, which typically make up at least 25% of the rock.
Pictures, Definition, Composition, Colors, Structures, Formation, Geology, Occurrence, and Uses of Arkose Sandstone.
Arkose is a reddish, pink, or sometimes grayish sandstone with over 25% feldspar. It is a medium-grained (with 0.0625-2 mm grains) clastic textured sedimentary rock with angular to subangular moderately to poorly sorted clasts.
Arkose, coarse sandstone (sedimentary rock composed of cemented grains 0.06–2 millimetres [0.0024–0.08 inch] in diameter) primarily made up of quartz and feldspar grains together with small amounts of mica, all moderately well sorted, slightly worn, and loosely cemented with calcite or, less.
Composition. Feldspar, Quartz. Color. Reddish brown. Miscellaneous. Feels sandy; Immature. Depositional Environment. Alluvial Fan, or Braided Stream. East Carolina University.
Arkose is commonly a current-deposited sandstone of continental origin, occurring as a thick, wedge-shaped mass of limited geographic extent (as in a fault trough or a rapidly subsiding basin); it may be strongly cross-bedded and associated with coarse granite-bearing conglomerate, and it may denote an environment of high relief and vigorous ...
Older literature and many introductory textbooks recognize three main types of sandstone: quartz sandstone (quartz-rich), arkose (feldspar-rich), and greywacke (muddy sandstone).
Arkose is a detrital sedimentary rock, specifically a type of sandstone containing at least 25% feldspar. Arkosic sand is sand that is similarly rich in feldspar, and thus the potential precursor of arkose. Quartz is commonly the dominant mineral component, and some mica is often present.
Arkose is a clastic or detrital sedimentary rock that is characterized by being rich in feldspar minerals, among them the most common are orthoclase, microcline and plagioclase.