smectite


Also found in: Dictionary, Wikipedia.
Related to smectite: Montmorillonite

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 samples contained a lot of honeycomb and flaky illite and smectite mixed layer, a small amount of needle-like chlorite and flake-flocculent chlorite and smectite mixed layer, and authigenic polyhedral quartz and strip albite crystal existing in particles.
[20] have measured this property of 18 smectite clays from 14 deposits, and based on these measurement results, they claimed that the value of the thermal conductivity was jointly influenced by soil parameters such as the water content, the dry density, the microstructure of clay samples, and the mineral composition of the soil as well.
Jayasekera (2004) presented results of studies performed on a smectite ([k.sub.hydraulic] = 2.4 x [10.sup.-9] [ms.sup.-1]) and a kaolinite ([k.sub.hydraulic] = 1 x 1 x [10.sup.-7] m [s.sup.-1]) at different pH, confirming that the electro-osmotic permeability of both clays was around [10.sup.-9] [m.sup.2] [V.sup.-1] [s.sup.-1].
The CEC value increases with increases in clay content and especially as smectite and ion exchange potential levels increase.
From Table 2 it could see that the main contents of clay minerals in the reservoir were the illite-smectite mixed layer, followed by illite and kaolinite; smectite was not independently developed but occupied a slight proportion in the illite-smectite mixed layer.
Zagros geological rocks and concluded that kaolinite, smectite, chlorite, illite, palygorskite and illite-smectite mixed-layer minerals were present in the rocks studied.
The K-fixation capacity of the soils ranged within 127-368 mg [kg.sup.-1], and the highest value was in the Alfisol with high clay and smectite content.
In the study, the smectite outperformed the weight loss drug orlistat in rats fed a high-fat diet for 2 weeks (Pharm Res.
The dissolution of unstable grains, probably amphibole grains (as indicated by the presence of Smectite clay) occurred during burial diagenesis (Selley, 2000).
When the middle diagenetic stage is entered, the kaolinite gradually becomes into smectite and illite in an alkaline diagenetic environment.
These are further separated into five groups (kaolinite, mica, smectite, vermiculite, and chlorite) that differ with respect to their net charge.
Clay minerals such as smectite swell when water goes in, which will produce swelling stress.