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Illite 21 sial found in slightly weathered soils b

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Unformatted text preview: 2 tetrahedral sheets with 1 octahedral sheet between them Within each group get a range of specific minerals, that differ in some aspects of their composi4on/structure •  Occurrence of specific clays in soils depends upon: –  1. type of rocks and minerals present –  2. intensity of leaching •  Controlled by: soil permeability, drainage, climate •  Clays classified by Si:Al ra4os: –  1:1, 2:1, etc. •  Examples: –  A. Illite 2:1 Si:Al – found in slightly weathered soils –  B. Vermiculite 2:1 Si:Al – found in moderately weathered soil...
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