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.)
Usually less than 2 mm in size
Sources Checked for Data in Record
- Submitted information Comment: José Delgado Rodrigues, LNEC, 2009.