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Definition of ooid

Ooids are small (≤2 mm in diameter), spheroidal, "coated" (layered) sedimentary grains, usually composed of calcium carbonate, but sometimes made up of iron- or phosphate-based minerals. Ooids usually form on the sea floor, most commonly in shallow tropical seas (around the Bahamas, for example, or in the Persian Gulf). After being buried under additional sediment, calcium carbonate-dominant ooid grains can be cemented together to form a limestone called an oolite.
See also Pisoids [glossary item missing].

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