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Chemical and Mineralogical Properties of Kaolinite-Rich Brazilian Soils

^a Rua dos Funcionários, 1540, Juvevê, Departamento de Solos, Universidade Federal do Paraná, Curitiba (PR), 80035-050, Brazil
^b Dep. of Agricultural Chemistry and Soil Science, The Univ. of Sydney, N.S.W. 2006, Australia
^c Departamento de Solos, Universidade Federal de Viçosa, Viçosa (MG), 36571-000, Brazil

View larger version (102K): [in a new window]   Fig. 1. Transmission electron microscope (TEM) micrographs of kaolinite from the clay fraction of some representative Brazilian soils showing a wide range of crystal morphologies and size. Various morphologies are indicated in the figure: Ro = rounded, Su = subeuhedral faces, Eh = euhedral, and Tu = tubular.

View larger version (14K): [in a new window]   Fig. 2. Relationship between K and Mg contents of kaolinite and asymmetry index (AI) for kaolinite in the clay fraction of some Brazilian soils.

View larger version (16K): [in a new window]   Fig. 3. Relationship between K and Mg contents, and mean crystal dimension (MCD) along the (001) axis of kaolinite in the clay fraction of some Brazilian soils.