Both gypsum and plaster of Paris contain the same compound,but in different stages of hydration.That compound is:

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Quizplus · Accepted Answer

Both gypsum and plaster of Paris contain calcium sulfate dihydrate (CaSO4 · 2H2O), but the difference between them is the degree of hydration. Gypsum is a natural mineral that is hydrated to form the dihydrate, whereas plaster of Paris is gypsum that has been heated to drive off the water of hydration, resulting in the hemihydrate form. Therefore, the compound present in both is CaSO4 · 2H2O.

Both Gypsum and Plaster of Paris Contain the Same Compound,but