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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.)

Other Properties

Usually less than 2 mm in size

Sources Checked for Data in Record

  • Submitted information Comment: José Delgado Rodrigues, LNEC, 2009.