Abstract
SummaryKaolin clays from soils in southeast Queensland give diffraction patterns which vary, particularly in the shape and position of the 00l reflections. To identify reasons for this variability, the kaolins in samples from forty soils were analysed for type, crystallinity, crystal size, and interstratification. Instrumental techniques used include X‐ray diffraction, infrared spectroscopy, and electron microscopy. Tiron‐extractable material was also determined.Properties of the clays are related to factors of soil formation; poor crystallinity of the kaolin and different amounts of Tiron‐extractable material are related to parent material. Kaolin of very small particle size (<0. 1 μm), is the main cause of broad 00l peaks and high basal spacing.
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