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      Question

      Which element is a primary constituent of orthoclase

      feldspar?
      A Calcium Correct Answer Incorrect Answer
      B Potassium Correct Answer Incorrect Answer
      C Iron Correct Answer Incorrect Answer
      D Magnesium Correct Answer Incorrect Answer
      E Sodium Correct Answer Incorrect Answer

      Solution

      Orthoclase (KalSi ₃ O ₈ ) is a potassium-rich feldspar. Plagioclase contains sodium or calcium.

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