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GK QUESTION#3428

What is formed when Anhydrite (CaSO₄) undergoes hydration?

  1. ALimonite
  2. BMagnesite
  3. CKaolin
  4. DGypsumCorrect answer
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Answer

D. Gypsum

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Explanation

Hydration of anhydrite forms gypsum: CaSO₄ + 2H₂O → CaSO₄·2H₂O. Anhydrite is anhydrous calcium sulphate, whereas gypsum contains two waters of crystallisation per formula unit. The other listed minerals are not this calcium-sulphate hydrate.

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