What is the name of the product formed when gypsum is calcined under steam pressure at 120-130°C or dehydrated in the presence of sodium succinate?

Explanation

The product obtained by heating gypsum under steam pressure at 120-130°C or by dehydration with sodium succinate is known as alpha-hemihydrate. Beta-hemihydrate forms under different conditions, while calcium sulfate dihydrate is the original gypsum, and orthorhombic anhydrite is a fully dehydrated form.