What is ‘Plaster of Paris’ chemically? How is it obtained from gypsum? Write the condition and chemical equation involved in its manufacture?

What is ‘Plaster of Paris’ chemically? How is it obtained from gypsum? Write the condition and chemical equation involved in its manufacture?

Plaster of Paris is calcium sulphate hemihydrate (CaSO4. 1/2H2O).
Gypsum, when heated at a temperature of about 380 K in a kiln, loses its three-fourth water of crystallisation and changes to plaster of Paris.
Following is the reaction involved

image :