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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 The name "plaster of Paris" was given because it was originally made by heating gypsum from a large deposit at Montmartre, a hill in ...
Mar 14, 2024 · Plaster of paris, quick-setting gypsum plaster consisting of a fine white powder, which hardens when moistened and allowed to dry. Given that it does not generally shrink or crack when dry, it is an excellent medium for casting molds. Learn more about how plaster of paris is prepared, its uses, and history.
- The Editors of Encyclopaedia Britannica
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. Upon adding water, after a few dozen minutes, plaster of Paris becomes ...
- 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 · One employs a waste mold, another a piece mold (both plaster of paris), and the third a g… plaster, plas·ter / ˈplastər/ • n. 1. a soft mixture of lime with sand or cement and water for spreading on walls, ceilings, or other structures to form a smo… Commune Of Paris, origins the franco-prussian war the versailles government the ...
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This "burnt" form of gypsum, long obtained from the quarries of the Montmartre district of Paris, came to be called "plaster of Paris." Occurrence. Gypsum is a common, rock-forming mineral, with thick, extensive beds formed by the evaporation of extremely saline waters. It is often associated with other minerals, such as halite and sulfur.
Mar 19, 2024 · Crude gypsum is used as a fluxing agent, fertilizer, filler in paper and textiles, and retarder in portland cement. About three-fourths of the total production is calcined for use as plaster of paris and as building materials in plaster, Keene’s cement, board products, and tiles and blocks.
