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Montmorillonite, a member of the smectite group, is a 2:1 clay, meaning that it has two tetrahedral sheets of silica sandwiching a central octahedral sheet of alumina. The particles are plate-shaped with an average diameter around 1 μm and a thickness of 0.96 nm ; magnification of about 25,000 times, using an electron microscope, is required ...
Bentonite layers from an ancient deposit of weathered volcanic ash tuff in Wyoming Gray shale and bentonites (Benton Shale; Colorado Springs, Colorado). Bentonite (/ ˈ b ɛ n t ə n aɪ t / BEN-tə-nyte) [1] [2] is an absorbent swelling clay consisting mostly of montmorillonite (a type of smectite) which can either be Na-montmorillonite or Ca-montmorillonite.
In clay mineralogy, smectite is synonym of montmorillonite (also the name of a pure clay mineral phase) to indicate a class of swelling clays. The term smectite is commonly used in Europe and in the UK while the term montmorillonite is preferred in North America, but both terms are equivalent and can be used interchangeably.
Bentonite is an absorbent aluminium phyllosilicate generally impure clay consisting mostly of montmorillonite.There are a few types of bentonites and their names depend on the dominant elements, such as potassium, sodium, calcium, and aluminium.
The clay mineral montmorillonite has been shown to catalyze the polymerization of RNA in aqueous solution from nucleotide monomers, [29] and the formation of membranes from lipids. [30] In 1998, Hyman Hartman proposed that "the first organisms were self-replicating iron-rich clays which fixed carbon dioxide into oxalic acid and other ...
Clay is a type of fine-grained natural soil material containing clay minerals [1] ... montmorillonite-smectite, and illite. Chlorite, vermiculite, [20] ...
Common components are montmorillonite, kaolinite, and attapulgite. Small amounts of other minerals may be present in fuller's earth deposits, including calcite, dolomite, and quartz. In some localities fuller's earth refers to calcium bentonite, which is altered volcanic ash composed mostly of montmorillonite. [2] [7]
Mountain soap has the same properties as one of its main varieties: bentonite or montmorillonite. This is a typical clay mineral belonging to the subclass of layered silicates, due to its structure it has the ability to swell strongly. In addition, mountain soap has pronounced sorption properties.
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