Plaster of Paris is produced by heating _________.

Plaster of Paris (${\text{CaSO}}_4\cdot \frac{1}{2}{\text{H}}_2\text{O}$) is chemically manufactured by carefully heating Gypsum (${\text{CaSO}}_4\cdot 2{\text{H}}_2\text{O}$) to a temperature of approximately $373\text{K}$ ($100^{\circ }\text{C}$). Heating past this range drives away all water molecules, creating dead-burnt plastic calcium sulfate.