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What (who) is Calcite - definition
CARBONATE MINERAL
Calcspar; Agaric Mineral; Lublinite; Mexican onyx; Green Calcite; Calcareous spar
![One of several calcite or alabaster perfume jars from the tomb of [[Tutankhamun]], d. 1323 BC](https://commons.wikimedia.org/wiki/Special:FilePath/Tutankhamun's Alabaster Jar.jpg?width=200 "One of several calcite or alabaster perfume jars from the tomb of [[Tutankhamun]], d. 1323 BC")
![Calcite with [[mottramite]]](https://commons.wikimedia.org/wiki/Special:FilePath/Calcite-Mottramite-cktsu-45b.jpg?width=200 "Calcite with [[mottramite]]")
![[[Trilobite]] eyes employed calcite](https://commons.wikimedia.org/wiki/Special:FilePath/Erbenochile eye.JPG?width=200 "[[Trilobite]] eyes employed calcite")
![Echinosphaerites aurantium]]'' (Middle [[Ordovician]], northeastern [[Estonia]])](https://commons.wikimedia.org/wiki/Special:FilePath/CalciteEchinosphaerites.jpg?width=200 "Echinosphaerites aurantium]]'' (Middle [[Ordovician]], northeastern [[Estonia]])")
![matrix]]](https://commons.wikimedia.org/wiki/Special:FilePath/Calcite-Dolomite-Gypsum-159389.jpg?width=200 "matrix]]")
![Calcite crystal canted at an angle, with little balls of [[hematite]] and crystals of [[chalcopyrite]] both on its surface and included just inside the surface of the crystal](https://commons.wikimedia.org/wiki/Special:FilePath/Calcite-Hematite-Chalcopyrite-176263.jpg?width=200 "Calcite crystal canted at an angle, with little balls of [[hematite]] and crystals of [[chalcopyrite]] both on its surface and included just inside the surface of the crystal")
![biopelsparite]]](https://commons.wikimedia.org/wiki/Special:FilePath/GeopetalCarboniferousNV.jpg?width=200 "biopelsparite]]")
![sparry]] calcite cement; [[Carmel Formation]], Middle [[Jurassic]], of southern [[Utah]], USA.](https://commons.wikimedia.org/wiki/Special:FilePath/OoidSurface01.jpg?width=200 "sparry]] calcite cement; [[Carmel Formation]], Middle [[Jurassic]], of southern [[Utah]], USA.")
![Several well formed milky white casts, made up of many small sharp calcite crystals, from the [[sulfur]] mines at [[Agrigento]], [[Sicily]]](https://commons.wikimedia.org/wiki/Special:FilePath/Calcite-Aragonite-Sulphur-69380.jpg?width=200 "Several well formed milky white casts, made up of many small sharp calcite crystals, from the [[sulfur]] mines at [[Agrigento]], [[Sicily]]")
![Reddish rhombohedral calcite crystals from [[China]]. Its red color is due to the presence of [[iron]]](https://commons.wikimedia.org/wiki/Special:FilePath/Calcite-tch21c.jpg?width=200 "Reddish rhombohedral calcite crystals from [[China]]. Its red color is due to the presence of [[iron]]")
![[[Cobalt]]oan, the cobalt-rich variety of calcite](https://commons.wikimedia.org/wiki/Special:FilePath/Calcite-75480.jpg?width=200 "[[Cobalt]]oan, the cobalt-rich variety of calcite")
![Sand calcites (calcites heavily included with desert sand) in [[South Dakota]], USA](https://commons.wikimedia.org/wiki/Special:FilePath/Calcite-114508.jpg?width=200 "Sand calcites (calcites heavily included with desert sand) in [[South Dakota]], USA")
![4,0 × 3,3 × 1,6 cm}}. José María Patoni, [[San Juan del Río, Durango]] ([[Mexico]])](https://commons.wikimedia.org/wiki/Special:FilePath/RM463c-calcite-butterfly-twin.jpg?width=200 "4,0 × 3,3 × 1,6 cm}}. José María Patoni, [[San Juan del Río, Durango]] ([[Mexico]])")
calcite
['kals??t]
¦ noun a white or colourless mineral consisting of calcium carbonate.
Derivatives
calcitic adjective
Origin
C19: from Ger. Calcit, from L. calx, calc- (see calx).
Calcite
·noun Calcium carbonate, or carbonate of lime. It is rhombohedral in its crystallization, and thus distinguished from aragonite. It includes common limestone, chalk, and marble. Called also calc-spar and calcareous spar.
calcareous spar
Iceland spar, Iceland crystal, crystallized carbonate of lime.
Wikipedia
Calcite
Calcite is a carbonate mineral and the most stable polymorph of calcium carbonate (CaCO3). It is a very common mineral, particularly as a component of limestone. Calcite defines hardness 3 on the Mohs scale of mineral hardness, based on scratch hardness comparison. Large calcite crystals are used in optical equipment, and limestone composed mostly of calcite has numerous uses.
Other polymorphs of calcium carbonate are the minerals aragonite and vaterite. Aragonite will change to calcite over timescales of days or less at temperatures exceeding 300 °C, and vaterite is even less stable.
Examples of use of Calcite
1. A closer examination reveals that the odd formation is an intricate crust of tiny calcite crystals.
2. Some scientists believe innumerable floods formed Snowy River, dropping a thin layer of calcite each time.
3. Boston and other scientists plan to take core samples of Snowy River to look for microbes that have been entombed in the calcite layer and for fossil evidence of past microscopic life.
4. They made calculations predicting how the shape should evolve based on the rate that calcite precipitates out of the drip water in the cave, the thickness of water films on the budding stalactites and other variables.
5. It‘s unlikely Snowy River ever will be open to anything but research because of the fragility of the tiny calcite crystals and microbes on the cave walls. ___ On the Net: Bureau of Land Management: http://www.blm.gov Fort Stanton Recreation Area: http://tinyurl.com/5onjnc National Cave and Karst Research Institute: http://www.nature.nps.gov/nckri/