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Wyoming bentonite - translation to ρωσικά
 4.jpg?width=200)
![2:1 [[clay mineral]]s crystallographic structure made of three superimposed sheets of Tetrahedra-Octahedra-Tetrahedra (TOT layer unit), respectively](https://commons.wikimedia.org/wiki/Special:FilePath/2-1 clay mineral scheme.png?width=200 "2:1 [[clay mineral]]s crystallographic structure made of three superimposed sheets of Tetrahedra-Octahedra-Tetrahedra (TOT layer unit), respectively")
![2+}} ions) compensating the negative electrical charges of the TOT layers and with [[water molecule]]s causing the interlayer expansion.](https://commons.wikimedia.org/wiki/Special:FilePath/Montmorillonite-en.svg?width=200 "2+}} ions) compensating the negative electrical charges of the TOT layers and with [[water molecule]]s causing the interlayer expansion.")
![weathered]] [[volcanic ash]] [[tuff]] in [[Wyoming]]](https://commons.wikimedia.org/wiki/Special:FilePath/Volcanic Tuff of Green River Formation in Wyoming.jpg?width=200 "weathered]] [[volcanic ash]] [[tuff]] in [[Wyoming]]")
нефтегазовая промышленность
вайомингский бентонит
нефтегазовая промышленность
кальциевый бентонит
нефтегазовая промышленность
натриевый бентонит
Ορισμός
Βικιπαίδεια
 4.jpg?width=120)
Bentonite () is an absorbent swelling clay consisting mostly of montmorillonite (a type of smectite) which can either be Na-montmorillonite or Ca-montmorillonite. Na-montmorillonite has a considerably greater swelling capacity than Ca-montmorillonite.
Bentonite usually forms from the weathering of volcanic ash in seawater, or by hydrothermal circulation through the porosity of volcanic ash beds, which converts (devitrification) the volcanic glass (obsidian, rhyolite, dacite) present in the ash into clay minerals. In the mineral alteration process, a large fraction (up to 40-50 wt.%) of amorphous silica is dissolved and leached away, leaving the bentonite deposit in place. Bentonite beds are white or pale blue or green (traces of reduced Fe2+
) in fresh exposures, turning to a cream color and then yellow, red, or brown (traces of oxidized Fe3+
) as the exposure is weathered further.
As a swelling clay, bentonite has the ability to absorb large quantities of water, which increases its volume by up to a factor of eight. This makes bentonite beds unsuitable for building and road construction. However, the swelling property is used to advantage in drilling mud and groundwater sealants. The montmorillonite / smectite making up bentonite is an aluminium phyllosilicate mineral, which takes the form of microscopic platy grains. These give the clay a very large total surface area, making bentonite a valuable adsorbent. The plates also adhere to each other when wet. This gives the clay a cohesiveness that makes it useful as a binder and as an additive to improve the plasticity of kaolinite clay used for pottery.
One of the first findings of bentonite was in the Cretaceous Benton Shale near Rock River, Wyoming. The Fort Benton Group, along with others in stratigraphic succession, was named after Fort Benton, Montana, in the mid-19th century by Fielding Bradford Meek and F. V. Hayden of the U.S. Geological Survey. Bentonite has since been found in many other locations, including China and Greece (bentonite deposit of the Milos volcanic island in the Aegean Sea). The total worldwide production of bentonite in 2018 was 20,400,000 metric tons.
