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A concretion is a hard, compact mass formed by the precipitation of mineral cement within the spaces between particles, and is found in sedimentary rock or soil. [1] Concretions are often ovoid or spherical in shape, although irregular shapes also occur.
a. : a hard usually inorganic mass (such as a bezoar or tophus) formed in a living body. b. : a mass of mineral matter found generally in rock of a composition different from its own and produced by deposition from aqueous solution in the rock. 2. : the act or process of concreting : the state of being concreted.
- Origins
- Appearance
- Composition
- Occurrence
- Types of Concretions
- References
Detailed studies (i.e., Boles et al., 1985; Thyne and Boles, 1989; Scotchman, 1991; Mozley and Burns, 1993; McBride et al., 2003; Chan et al., 2005; Mozley and Davis, 2005) published in peer-reviewed journals, have demonstrated that they form subsequent to burial during diagenesis. They quite often, but not always, form by the precipitation of a co...
Concretions vary in shape, hardness and size, ranging from objects that require a magnifying lens to be clearly visible to huge bodies three meters in diameter and weighing several thousand pounds. The giant, red concretions occurring in Theodore Roosevelt National Park, in North Dakota, are almost 3 m (10 feet) in diameter. Spheroidal concretions,...
They are commonly composed of a carbonate mineral such as calcite; an amorphous or microcrystalline form of silica such as chert, flint, or jasper; or an iron oxide or hydroxide such as goethite and hematite. They can also be composed of other minerals that include dolomite, ankerite, siderite, pyrite, marcasite, barite and gypsum, to name a few. A...
Concretions are found in a wide variety of rocks, and are particularly common in shales, siltstones, and sandstones. They often outwardly resemble fossils or rocks that look as if they do not belong to the stratum in which they were found. Occasionally, concretions contain a fossil, either as its nucleus or as a component that was incorporated duri...
Some of the types and names, which are often found mentioned on the Internet and in popular articles, of concretions are septarian concretions, cannonball concretions, Moqui (Moki) marbles, and pop rocks.
Al-Agha, M.R., S.D. Burley, C.D. Curtis, and J. Esson, 1995, Complex cementation textures and authigenic mineral assemblages in Recent concretions from the Linconshire Wash (east coast, UK) driven...
1. the act or process of coming or growing together; coalescence. 2. a solid or solidified mass. 3. something made real, tangible, or specific. 4. any of various rounded or irregular mineral masses formed by chemical precipitation around a nucleus, such as a bone or shell, that is different in composition from the sedimentary rock that surrounds it
noun. the act or process of coming or growing together; coalescence. a solid or solidified mass. something made real, tangible, or specific. any of various rounded or irregular mineral masses formed by chemical precipitation around a nucleus, such as a bone or shell, that is different in composition from the sedimentary rock that surrounds it.
definition 3: a solid mass made by or as if by coalescence, such as a mass of calcium or other inorganic material found in living tissue, or a mineral mass found in sedimentary rock.
A concretion is a hard, compact mass of matter formed by the precipitation of mineral cement within the spaces between particles, and is found in sedimentary rock or soil. Concretions are often ovoid or spherical in shape, although irregular shapes also occur.
