alabaster (n.)

1.a very light white

2.a compact fine-textured usually white gypsum used for carving

3.a hard compact kind of calcite

Calcium Sulfate (descriptor)

1.A calcium salt that is used for a variety of purposes including: building materials, as a desiccant, in dentistry as an impression material, cast, or die, and in medicine for immobilizing casts and as a tablet excipient. It exists in various forms and states of hydration. Plaster of Paris is a mixture of powdered and heat-treated gypsum.