smectite

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smectite

[′smek‚tīt]
(mineralogy)
Dioctahedral (montmorillonite) and trioctahedral (saponite) clay minerals, and their chemical varieties characterized by swelling properties and high cation-exchange capacities.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
References in periodicals archive ?
The main clay minerals for K fixation in calcareous soils of Iran are smectites (Najafi Ghiri and Abtahi 2012).
At low temperature (<200[degrees]C), Na-Ca-bearing zeolites, trioctahedral (Ca)-Mg-Fe-bearing smectites, and calcite were stable, whereas at high temperature (>200[degrees]C), these minerals were replaced by chlorite-(Mg-Fe), albite, quartz, and Ca-bearing aluminosilicates, including epidote, wairakite, prehnite, and clinozoisite.
In Colombia, deposits with smectites resources have been identified for possible exploitation, mainly in the departments of Valle del Cauca and Tolima [22, 23].
Otsuka, "Effects of layer charge, charge location, and energy change on expansion properties of dioctahedral smectites," Clays and Clay Minerals, vol.
Notwithstanding the diverse beneficial effects of smectites, the hydration behavior of these mineral is very sensitive to the change of the environmental surrounding conditions (i.e., temperature, pressure, and RH), which may influence the stability of the clay microstructure therefore the stability of the geotechnical barrier.
Physically eroded mica/illite and chlorite are generally interpreted to occur under cold climate conditions, whereas smectite and kaolinite are formed from chemical weathering mechanisms under warm and humid climate conditions.
A reference dioctahedral smectite SWy2 originated from bentonites of Wyoming (Wyoming, USA) is selected for the present study.
2000); these substitutions are less numerous in other hydrous 2: 1 minerals such as smectites. On the whole, these properties offer considerable interest in the production of pillared clays, which are distinguishable from an intercalated layered solid due to their micro and/or mesoporosity and high thermal stability with preservation of the layer stacking (Moreno et al.