The calcined gypsum sets quickly, which is one quality that has historically made plaster of Paris so useful.

When calcined gypsum is added to soil, however, the setting time is reduced even further, to mere minutes.

It is often less costly, since earth and calcined gypsum are plentiful and cheap materials to acquire.

Plaster of Paris is calcined gypsum (roasted gypsum), ground to a fine powder by milling.

H2O), also known as gypsum plaster, stucco, calcined gypsum or plaster of Paris.

Small amounts of calcined gypsum are added to earth to create strong structures directly from cast earth, an alternative to adobe (which loses its strength when wet).

The ancient Egyptians also developed starch based pastes for the bonding of papyrus to clothing and a plaster of Paris like material made of calcined gypsum.

A large gypsum deposit at Montmartre in Paris led "calcined gypsum" (roasted gypsum or gypsum plaster) to be commonly known as "plaster of Paris".

The partially dehydrated mineral is called calcium sulfate hemihydrate or calcined gypsum (commonly known as plaster of Paris) (CaSO nHO), where n is in the range 0.5 to 0.8.

Because gypsum from the quarries of the Montmartre district of Paris have long furnished burnt gypsum (calcined gypsum) used for various purposes, this dehydrated gypsum became known as plaster of Paris.

Based on the earlier unpatented Turkish Alker, it is a concrete-like composite with soil (of a suitable composition) as its bulk component, but is set with about 15% calcined gypsum (plaster of Paris) instead of cement.

For their finest work the Egyptians used a plaster made from calcined gypsum just like plaster of Paris of the present time, and their methods of plastering on reeds resemble in every way our lath, plaster, float and set work.