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Kaolinite has a layer structure described as

  • A.having no regular layer arrangement whatsoever at all
  • B.one to one, a tetrahedral sheet joined to an octahedral one
  • C.two to one, with one octahedral sheet between two tetrahedral ones
  • D.three to one, with three quite separate tetrahedral sheets

Answer: B

The alternating single pair of sheets is held to its neighbours by hydrogen bonding, which is strong enough to prevent water entering between the layers. This is why kaolinite does not swell in the way the two-to-one minerals do.

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