illite


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illite

[′i‚līt]
(mineralogy)
A group of gray, green, or yellowish-brown micalike clay minerals found in argillaceous sediments; intermediate in composition and structure between montmorillonite and muscovite.

illite

A clay mineral, a hydrous silicate of potassium, aluminum, iron, and magnesium; swells considerably on wetting and shrinks proportionately on drying.
References in periodicals archive ?
In the case of rice wheat cropping, vermiculite content decreased with depth, illite content decreased from [L.sub.1] to [L.sub.3] and then increased for [L.sub.4] and [L.sub.5].
The upper layer consists, from the mineralogical viewpoint, of quartz, kaolinite, illite, montmorillonite.
This confirmed that the material consists of felspar (disordered anorthoclase), alpha quartz, kaolinite and illite. The illite was a surprise, I have to admit.
On a trouve que l'effet adverse de l'argile d'illite sur la recuperation de bitume etait relie a son acidite.
Paleozoic shales of the Till Plains contain more illite and chlorite than kaolinite, whereas Pennsylvanian shales or underclays of the plateau contain a larger proportion of kaolinite (Volpi and Szabo 1988).
Illite (Figure 7-11) is a 2:1 type clay with moderate surface area (100-120 [m.sup.2]/g) and moderately high negative surface charge.
In order to find indicators of the critical temperature for the hydrothermal deposition of low quartz in the andesite of Las Vigas, chlorite and illite were analyzed by microprobe, and the resulting values were fitted into the temperature curves of Cathelineau et al.
* Illite has the same substitutions as vermiculite.
X-ray diffraction analysis of the residue shows quartz as the dominant residue component, with scarcely more than trace quantities of magnesium calcite (Ca, Mg)[CO.sub.3] and the clay mineral illite ([KAl.sub.2]([OH.sub.2]).
Clay samples are dominated by either smectite or mixed-layer clays and contain lesser amounts of illite and kaolinite.