What is the hemihydrate of calcium sulphate commonly known as?

Q. What is the hemihydrate of calcium sulphate commonly known as?
Answer: Plaster of Paris
Notes: Plaster of Paris is the common name of calcium sulphate hemihydrate because half molecule of water is attached with calcium sulphate. The chemical formula of plaster of Paris is CaSO₄.1/2H₂O.

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