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Common Phyllosilicates

Common Phyllosilicates (Introduction to soil science · Common Soil Phyllosilicates) — "The common soil phyllosilicates, in increasing order of weathering, are…

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  • Common soil phyllosilicates differ in weathering order, interlayer structure, and swelling.
  • In increasing order of weathering, they are mica or illite, vermiculite, smectite, and kaolinite.
  • Mica or illite
  • Mica has a 2:1 structure.
  • Potassium occupies mica’s tightly closed interlayer.
  • Mica does not swell.
  • Intermediate phyllosilicates
  • Vermiculite
  • Vermiculite has a water-accessible interlayer.
  • Smectite
  • Smectite has a water-accessible interlayer.
  • Vermiculite and smectite show progressively greater swelling.
  • Kaolinite
  • Kaolinite has a 1:1 structure.
  • Kaolinite has no interlayer.
  • Kaolinite does not swell.
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Common Phyllosilicates

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Introduction to soil science

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"The common soil phyllosilicates, in increasing order of weathering, are mica or illite, vermiculite, smectite, and kaolinite. Mica has a 2:1 structure with potassium in a tightly closed interlayer and does not swell. Vermiculite and smectite have water-accessible interlayers and progressively greater swelling, while kaolinite has a 1:1 structure with no interlayer and does not swell."

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