Dead burnt plaster is:
$\text{CaSO}_4$
$\text{CaSO}_4 \cdot \frac{1}{2} \text{H}_2\text{O}$
$\text{CaSO}_4 \cdot \text{H}_2\text{O}$
$\text{CaSO}_4 \cdot 2\text{H}_2\text{O}$
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