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      Question

      Of the following minerals, the one that expands on

      wetting is:
      A Muscovite Correct Answer Incorrect Answer
      B Illite Correct Answer Incorrect Answer
      C Montmorillonite Correct Answer Incorrect Answer
      D Kaolinite Correct Answer Incorrect Answer

      Solution

      Montmorillonite is a 2:1 clay mineral with weak bonds between its layers. This allows water molecules to enter the internal structure, causing the mineral to swell significantly when wet.

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