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Scanning electron microscope (SEM) photograph of smectite clay – magnification 23,500 – U.S. Geological Survey – Tuckup CanyonTypical cracks pattern of a smectite-rich bentonite after its desiccation and shrinkage
A smectite (from Ancient Greek σμηκτός (smēktós) 'lubricated'; from σμηκτρίς (smēktrís) 'walker's earth, fuller's earth'; lit.'rubbing earth; earth that has the property of cleaning')[1] is a mineral mixture of various swelling sheet silicates (phyllosilicates), which have a three-layer 2:1 (TOT) structure and belong to the clay minerals. Smectites mainly consist of montmorillonite, but can often contain secondary minerals such as quartz and calcite.[2]
^CNRLT (2012). "Smectite : Définition de smectite" [Smectite: Definition of smectite]. cnrtl.fr (in French). Retrieved 28 July 2022. Terre qui a la propriété de nettoyer. Earth that has the property of cleaning
^
Friedrich Klockmann (1978) [1891], Paul Ramdohr, Hugo Strunz (ed.), Klockmanns Lehrbuch der Mineralogie (in German) (16. ed.), Stuttgart: Enke, p. 753, ISBN 3-432-82986-8
similarities. Smectite group which includes dioctahedral smectites, such as montmorillonite, nontronite and beidellite, and trioctahedral smectites, such as...
absorbent swelling clay consisting mostly of montmorillonite (a type of smectite) which can either be Na-montmorillonite or Ca-montmorillonite. Na-montmorillonite...
expandable smectites, whereas in older rocks (especially in mid-to early Paleozoic shales) illites predominate. The transformation of smectite to illite...
is named after Montmorillon in France. Montmorillonite, a member of the smectite group, is a 2:1 clay, meaning that it has two tetrahedral sheets of silica...
silt and less than 40% clay are called loam. Some clay minerals (such as smectite) are described as swelling clay minerals, because they have a great capacity...
known as montmorillonite. Diosmectite is a contraction of "dioctahedral smectite". Its effectiveness in improving stool consistency is the result of its...
clays with high swelling properties, such as smectites, are often very fertile. For example, the smectite-rich paddy soils of Thailand's Central Plains...
feldspars happens by hydrolysis and produces clay minerals, including illite, smectite, and kaolinite. Hydrolysis of feldspars begins with the feldspar dissolving...
proportion of other clay minerals such as illite (in cooler climates) or smectite (in drier climates) increases. Such climatically related differences in...
built on them. Soils when wet retain water, and some expand in volume (smectite clay). The amount of expansion is related to the ability of the soil to...
composite of smectite and palygorskite. Smectites are expanding lattice clays, of which bentonite is a commonly known generic name for smectite clays. The...
glauconies and consist of a mixture of mixed-layer clay minerals, such as smectite and glauconite. Greensand is also loosely applied to any glauconitic sediment...
][dubious – discuss] is closely related to meerschaum. It is a synonym for the smectite clay: stevensite. In the 2004 film National Treasure, the second clue to...
that they often prefer soils with high clay content, usually with the smectite clay families being well represented. The preference for certain types...
within the Mojave Desert has been observed to weather into a green colored smectite-rich clay soil. Yellow soils may indicate iron accumulation as well, though...
Fripiat, J. J. (1974). "Interlamellar Adsorption of Carbon Dioxide by Smectites" (PDF). Clays and Clay Minerals. 22 (1): 23–30. Bibcode:1974CCM....22...
anionic surfactants directly. Other anionic softeners can be based on smectite clays. Some compounds, such as ethoxylated phosphate esters, have softening...
needed] of wall rock which introduces clay minerals including kaolinite, smectite and illite. The process generally occurs at low temperatures and may occur...
minerals have been weathered to clay minerals like kaolinite, illite or smectite. Among the three major types of rock, fossils are most commonly found in...
the long-term. Scientists experimented with adding bentonite, one of the smectite family of clays, to the soil. In field trials, conducted by scientists...
et al. (2009). "Mineralogical and Physicochemical Investigation of Mg-Smectite from Jbel Ghassoul, Morocco". Clays and Clay Minerals. 57 (2): 264–270...
in drier seasons or years; such soils are called vertisols. Soils with smectite clay minerals, including montmorillonite and bentonite, have the most dramatic...
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