An oolite (egg stone) is a sedimentary rock formed from ooids, spherical grains composed of concentric layers. Sedimentary rock is one of the three main rock types (the others being igneous and Metamorphic rock) Ooids are small ( Sedimentary grains usually composed of Calcium carbonate, but sometimes made up of Iron The name derives from the Hellenic word òoion for egg. The Ancient Greek language is the historical stage in the development of the Hellenic language family spanning the Archaic (c In most Birds and Reptiles an egg ( Latin ovum) is the Zygote, resulting from Fertilization of the Ovum. Strictly, oolites consist of ooids of diameter 0. 25–2 mm: rocks composed of ooids larger than 2 mm are called pisolites. In Geology, rock is a naturally occurring aggregate of Minerals and/or Mineraloids The Earth's outer solid layer the ‘ Lithosphere A pisolite is a Sedimentary rock formed from pisoliths. These are concretions - often of calcium carbonate but commonly in rarer minerals - which resemble Ooids
Composition
Ooids are most commonly composed of calcium carbonate (calcite or aragonite), but can be composed of phosphate, chert, dolomite or iron minerals, including hematite. Calcium carbonate is a Chemical compound with the Chemical formula Ca[[Carbon C]] O 3 Calcite is a carbonate mineral and the most stable polymorph of Calcium carbonate ( Ca[[carbon C]] O 3 Aragonite is a Carbonate mineral, one of the two common naturally occurring polymorphs of Calcium carbonate, Ca[[carbon C]] O 3 Chert (ˈtʃɝt is a fine-grained Silica -rich Microcrystalline, Cryptocrystalline or Microfibrous Sedimentary rock that may contain Dolomite (ˈdɒləmaɪt is the name of a Sedimentary Carbonate rock and a Mineral, both composed Iron (ˈаɪɚn is a Chemical element with the symbol Fe (ferrum and Atomic number 26 Hematite, also spelt hæmatite, is the Mineral form of Iron(III oxide (Fe2O3 one of several Iron oxides Dolomitic and chert ooids are most likely the result of the replacement of the original texture in limestone. Oolitic hematite occurs at Red Mountain near Birmingham, Alabama along with oolitic limestone. Description At Birmingham the lower is predominantly shaly and there Birmingham (ˈbɝmɪŋhæm is the largest City in the US state of Alabama and is the County seat of Jefferson County.
Occurrence
Some exemplar oolitic limestone, a common term for an oolite, was formed in England during the Jurassic period, and forms the Cotswold Hills, the Isle of Portland, and part of the North Yorkshire Moors. Limestone is a Sedimentary rock composed largely of the Mineral Calcite ( Calcium carbonate: CaCO3 England is a Country which is part of the United Kingdom. Its inhabitants account for more than 83% of the total UK population whilst its mainland The Jurassic is a geologic period and system that extends from about Ma (million years ago to Ma that is from the end of the Triassic to the beginning See also Cotswold The Cotswolds is a range of Hills in west-central England, sometimes called the "Heart of England" The Isle of Portland ( is a limestone tied island long by wide in the English Channel. The North York Moors (also known as the North Yorkshire Moors) is a national park in North Yorkshire, England. A particular type, Bath Stone, gives the buildings of the World Heritage City of Bath their distinctive appearance. Bath Stone is an Oolitic Limestone comprising granular fragments of Calcium carbonate. A UNESCO World Heritage Site is a site (such as a Forest, Mountain, Lake, Desert, Monument, Building, complex Bath is a city in Somerset in the south west of England It is situated west of London and south-east of Bristol.
This type of limestone is also found in Indiana in the United States. The State of Indiana ( was the 19th US state admitted into the union The United States of America —commonly referred to as the The town of Oolitic, Indiana was founded for the trade of limestone and bears its name. Oolitic is a town in Indian Creek and Shawswick townships Lawrence County, Indiana, United States. Quarries in Bedford, Oolitic, and Bloomington contributed the materials for such iconic US landmarks as the Empire State Building and the Pentagon. Bedford is a city in Shawswick Township, Lawrence County, Indiana, United States. Bloomington is a city and the County seat of Monroe County in the south central region of the U The Empire State Building is a 102-story Art Deco Skyscraper in New York City at the intersection of Fifth Avenue and West 34th Street The Pentagon is the Headquarters of the United States Department of Defense, located in Arlington County, Virginia. The Soldiers' and Sailors' Monument in downtown Indianapolis is built almost solely of grey oolitic limestone. The Indiana Soldiers' and Sailors' Monument is a 284-feet tall neoclassical oolitic Limestone and Bronze Monument in the center of
The movie Breaking Away centers around the sons of quarry workers in Bloomington, the home of Indiana University. Breaking Away is a 1979 film that tells the story of four teenagers in Bloomington Indiana who have graduated from high school and are not sure what they Indiana University is the flagship campus of the Indiana University system. Almost all of the buildings on the Indiana University campus are built with native oolitic limestone material.
Roggenstein is a term describing a specific type of oolite one in which the cementing matter is argillaceous.
See also
- Geologic timescale
- Geology of the United Kingdom
- Pearls: also formed from concentric layers of calcium carbonate
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