CONCRETION

Concretion

A concretion is a hard, compact mass of sedimentary rock formed by the precipitation of mineral cement within the spaces between the sediment grains. Concretions are often ovoid or spherical in shape, although irregular shapes also occur. The word 'concretion' is derived from the Latin con meaning 'together' and crescere meaning 'to grow'. Concretions form within layers of sedimentary strata that have already been deposited. They usually form early in the burial history of the sediment, before the rest of the sediment is hardened into rock. This concretionary cement often makes the concretion harder and more resistant to weathering than the host stratum.

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concretion

Noun

  1. The process of aggregating or coalescing into a mass.
  2. A solid, hard mass formed by a process of aggregation or coalescence.
  3. A rounded mass of a mineral, sometimes found in sedimentary rock or on the ocean floor.
  4. The action of making something concrete or the result of such an action.


The above text is a snippet from Wiktionary: concretion
and as such is available under the Creative Commons Attribution/Share-Alike License.

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