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      Question

      What is the primary reason for the non-expanding nature

      of fine-grained micas within the 2:1-type minerals?
      A Presence of potassium ions Correct Answer Incorrect Answer
      B Larger crystal size Correct Answer Incorrect Answer
      C Octahedral sheet dominance Correct Answer Incorrect Answer
      D Water adsorption Correct Answer Incorrect Answer
      E Strong hydrogen bonding Correct Answer Incorrect Answer

      Solution

      Potassium ions act as binding agents, preventing the expansion of the crystal structure, thus making fine-grained micas non-expanding .

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