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Spherical to ellipsoidal body which may or may not have a nucleus and has concentric or radial structure or both. Ooids are is usually calcareous, but may be siliceous, hematitic, or of other composition. A Sedimentary rock containing numerous ooid grains that are cemented together is called an oolite. See also Oolitic limestone.

Synonyms and Related Terms

oolith; oólito (Port.)

Physical and Chemical Properties

  • Usually less than 2 mm in size

Resources and Citations

  • José Delgado Rodrigues, LNEC, Submitted information 2009.