gypsum(redirected from Calcium sulfate dihydrate)
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Related to Calcium sulfate dihydrate: magnesium sulfate heptahydrate
A widespread colorless, white, or yellowish mineral, CaSO4·2H2O, used in the manufacture of plaster of Paris, various plaster products, and fertilizers.
[Middle English gipsum, from Latin gypsum, from Greek gupsos, probably of Semitic origin; akin to Arabic jibs, jiṣṣ, jaṣṣ, from Akkadian gaṣṣu.]
(Minerals) a colourless or white mineral sometimes tinted by impurities, found in beds as an evaporite. It is used in the manufacture of plaster of Paris, cement, paint, school chalk, glass, and fertilizer. Composition: hydrated calcium sulphate. Formula: CaSO4.2H2O. Crystal structure: monoclinic
[C17: from Latin, from Greek gupsos chalk, plaster, cement, of Semitic origin]
a soft mineral, hydrous calcium sulfate, CaSO4∙2H2O, occurring in massive or fibrous form and also as alabaster and selenite: used to make plaster of Paris and as a fertilizer.
[1640–50; < Latin < Greek gýpsos chalk, gypsum]
A colorless, white, or pinkish mineral consisting of calcium sulfate. Gypsum occurs as individual blade-shaped crystals or as massive beds in sedimentary rocks. It is used in manufacturing plasterboard, cement, and fertilizers. It is the mineral used to represent a hardness of 2 on the Mohs scale.
gypsum- From Semitic, a relative or ancestor of Arabic jibs and Hebrew gephes, "plaster."
See also related terms for plaster.
A mineral or rock composed of calcium sulfate and water.
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|Noun||1.||gypsum - a common white or colorless mineral (hydrated calcium sulphate) used to make cements and plasters (especially plaster of Paris)|
atomic number 20, Ca, calcium - a white metallic element that burns with a brilliant light; the fifth most abundant element in the earth's crust; an important component of most plants and animals
mineral - solid homogeneous inorganic substances occurring in nature having a definite chemical composition
alabaster - a compact fine-textured, usually white gypsum used for carving
gesso - gypsum or plaster of Paris spread on a surface to make it suitable for painting or gilding (or a surface so prepared)
terra alba - finely pulverized gypsum used especially as a pigment