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- plaster of paris, quick-setting gypsum plaster consisting of a fine white powder (calcium sulfate hemihydrate), which hardens when moistened and allowed to dry. Known since ancient times, plaster of paris is so called because of its preparation from the abundant gypsum found near Paris.
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plaster of paris, quick-setting gypsum plaster consisting of a fine white powder (calcium sulfate hemihydrate), which hardens when moistened and allowed to dry. Known since ancient times, plaster of paris is so called because of its preparation from the abundant gypsum found near Paris.
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Gypsum plaster (plaster of Paris) Gypsum plaster, also known as plaster of Paris, is a white powder consisting of calcium sulfate hemihydrate. The natural form of the compound is the mineral bassanite. Etymology. The name "plaster of Paris" was given because it was originally made by heating gypsum from a large deposit at Montmartre, a hill in ...
The word gypsum is derived from the Greek word γύψος (gypsos), "plaster". Because 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 .
- Massive, flat. Elongated and generally prismatic crystals
- Prismatic (2/m), H-M symbol: (2/m)
- 1.5–2 (defining mineral for 2)
- Monoclinic
May 18, 2018 · views 2,269,657 updated May 18 2018. plaster of Paris (POP) n. a preparation of gypsum (calcium sulphate) that sets hard when water is added. It is used in dentistry and orthopaedics for preparing plaster casts. A Dictionary of Nursing.
Chemical Composition. Scientifically known as Calcium Sulfate Hemihydrate, Plaster of Paris is chemically represented as CaSO 4 .1/2H 2 O. This represents the ratio of calcium sulfate to water, suggesting that for each molecule of calcium sulfate, there is half a molecule of water.
Oct 16, 2013 · 1. History. The name Plaster of Paris (POP) had its origins from the fact that it was extensively mined from Montmartre in Paris district. But its use predates the industrial revolution, they have been found on the insides of pyramids.
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