OOID
Ooid
Ooids are small, spheroidal, "coated" 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 . After being buried under additional sediment, these ooid grains can be cemented together to form a sedimentary rock called an oolite. Oolites usually consist of calcium carbonate meaning they belong to the limestone rock family. Pisoids are similar to ooids, but are larger than 2 mm in diameter, often considerably larger, as with the pisoids in the hot springs at Carlsbad in the Czech Republic.The above text is a snippet from Wikipedia: Ooid
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ooid
Noun
- A small calcium carbonate or iron coated grain found on the seafloor.
Adjective
The above text is a snippet from Wiktionary: ooid
and as such is available under the Creative Commons Attribution/Share-Alike License.