Latest Calcite Stories
Sally sees seashells down by the seashore. (Say that 5 times fast.) Sally never knew why seashells' minerals (calcium carbonate) could form two different compounds until now.
Study shows calcium carbonate takes multiple, simultaneous roads to different minerals, provides insight into trapping carbon dioxide in underground rock.
Climate change dating as far back as hundreds of million years ago was recorded in the shells of ancient oceanic plankton, according to new research published in the journal Earth and Planetary Sciences Letters.
Corals may be better placed to cope with the gradual acidification of the world’s oceans than previously thought – giving rise to hopes that coral reefs might escape climatic devastation.
A team of German scientists recently decoded the molecular structure of the unusually sturdy spines of sea urchins, a discovery that they believe could eventually prove useful in helping engineers construct stronger, more stable buildings.
The acidification of the worldâ€™s oceans could have major consequences for the marine environment.
An international research team, with Spanish participation, has discovered a new species of mollusk, Polyconites hadriani, in various parts of the Iberian Peninsula.
Researchers in Britain and Denmark have unveiled an â€˜invisibility cloakâ€™ that uses a common crystalline material known as calcite, which works by sending its two "polarizations" of light in different directions.
The ability to tell the difference between crystals that formed naturally and those formed by human activity can be important to archaeologists in the field.
Which came first: the chicken or the egg? It is an age old question that has spurred on many a debate, but now a group of scientists might actually be close to having an answer.
Aragonite is a polymorph of the mineral calcite, both having the chemical composition CaCO3. Its structure differs from calcite and leads to a different crystal shape, an orthorhombic system with acicular crystals. By repeated twinning pseudo-hexagonal forms result. It may be columnar or fibrous, occasionally in branching stalactitic forms called flos-ferri (flowers of iron) from their association with the ores at the Carthinian iron mines. The type location for aragonite is Molina de...
he mineral calcite is a calcium carbonate corresponding to the formula CaCO3 and is one of the most widely distributed minerals on the Earth's surface. It is a common constituent of sedimentary rocks, limestone in particular. It is also the primary mineral in metamorphic marble. It also occurs as a vein mineral in deposits from hot springs, and also occurs in caverns as stalactites and stalagmites. Calcite is often the primary constituent of the shells of marine organisms (e.g. plankton,...
Limestone is a sedimentary rock composed of the mineral calcite (calcium carbonate). The primary source of this calcite is usually marine organisms. These organisms secrete shells that settle out of the water column and are deposited on ocean floors as pelagic ooze (see lysocline for information on calcite dissolution). Secondary calcite may also be deposited by supersaturated meteoric waters (groundwater that precipitates the material in caves). This produces speleothems such as stalagmites...
- Any of various tropical Old World birds of the family Indicatoridae, some species of which lead people or animals to the nests of wild honeybees. The birds eat the wax and larvae that remain after the nest has been destroyed for its honey.