clay mineral

To study the effect of different extractants on clay mineral and soil carbonate dissolution (due to the importance of carbonates in the studied soils), the contents of Ca, Mg, Al and K extracted by Ca[Cl.sub.2], HC1, citric acid and oxalic acid solutions were determined during the short- and long-term experiments (Table 3).

Bauxite is a mixture of minerals such as gibbsite, boehmite and diaspore, iron oxides such as goethite and hematite, clay mineral kaolinite and some amounts of anatase.

Studies on acid contaminated soils indicated that dissolution of aluminosilicate of clay mineral with subsequent mineral formations leads to volume changes in soils (Sokolovich 1995; Mal'tsev 1998; Sivapullaiah et al.

However, the potential impact of various factors (e.g., clay mineral composition, water content, grain gradation, and confining pressure) has not yet been reported.

The chemical modification of clay mineral through the use of cationic surfactant to generate organoclays [29] has applications in environmental remediation [30].

In soil mineralogy, VNIR can be used to characterize various soil mineralogic properties such as clay mineral composition, clay content, and mineral weathering/alteration degree, although quartz and feldspar have weak/nonexistent absorption in the VNIR range [22-24].

As a chloritic clay mineral of unusual type, corrensite in a natural system was documented from the Triassic in England (Stephen and MacEwan, 1951).

In order to determine the clay mineral associations, the XRD patterns of oriented air-dried preparations of clay fraction ([less than or equal to]2 [micro]m) were analysed.