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Why is calcium sulphate hemihydrates called Plaster of Paris?

Why is calcium sulphate hemihydrates called Plaster of Paris?Plaster of Paris is obtained by heating gypsum or calcium sulphate dihydrate to about 140-180 degree Celsius. When heated to such a temperature, gypsum forms Plaster of Paris. The name is derived from the large deposits of gypsum in the Montmartre hill in Paris.

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