a sodium calcium sulfate mineral (CaSO•2H O), colorless, white, or yellowish, found in powder or crystal form. Used for plaster, cement, and medicinal purposes; thought to be mined by Native Americans. Found in dry sections of Mammoth Cave, where it precipitates from the walls in the form of gypsum "flowers."

(gyp'-sum) A monoclinic mineral (CaSO4 .2H2O) that is colorless to white in crystals but gypsum in massive beds may range from red to yellow to brown, gray, or black. It is the most common natural sulfate mineral. Gypsum defines 2 on the Mohs hardness scale. It is commonly associated with rock salt (halite) and anhydrite and forms beds and lenses interstratified with limestone, shale, and clay, especially in rocks of Permian to Triassic age. Gypsum also occurs in volcanic fumarolic deposits and as an accessory mineral in metalliferous veins.

Calcium sulphate formed under heat and pressure from sediments in ocean brine.

A sedimentary rock consisting of hydrated calcium sulphate.

A chalk formation containing the native hydrous sulphate of calcium.

Common chemical calcium sulfate used to make plaster of Paris.

A hydrated sulfate of calcium occurring naturally in sedimentary rock. In roofing, a type of lightweight deck made from this pulverized rock.

Calcium sulphate CaSO42H2O

Gypsum, which occurs naturally in sedimentary rocks, is a dry organic fertilizer that supplies two important micronutrients: calcium and sulfur.

A common mineral of evaporates in inland salt playas. Calcium sulphate

Hydrated calcium sulphate (CaS)42H20

see Alabaster, Plaster (Plaster of Paris)

a common white or colorless mineral (hydrated calcium sulphate) used to make cements and plasters (especially plaster of Paris)

edimentary rock created by the chemical precipitation of calcium, sulfur, and oxygen.

a sulfate mineral with the chemical formula of CaSO4*2H2O

Hydrous sulfate of lime, occurring in massive, fibrous, foliated or granular form. When calcined, it is called "Plaster of Paris."

A very soft mineral composed of calcium sulphate with application in floor and wall boards, surface filler and plaster.

A mineral composed of calcium sulfate that is added to the soil to improve drainage and aeration and to supply calcium.

Mineral formed by evaporation, with the molecular structure: CaSO4.2H2O

A white, chalk-like mineral. ( calcium sulfate)

CaSO4.2H2O. The dihydrate of calcium sulphate from which the various forms of gypsum plaster are prepared by dehydration, and to which they revert on setting.

A mineral consisting of hydrated calcium sulfate.

A hydrated calcium sulfate (CaSO42H20). It is formed naturally as the result of the reaction of sulfuric acid produced by the decomposition of pyrite upon the calcium carbonate of shells existing in clay. A sedimentary rock.

Anhydrous calcium sulphate. A material similar to chalk used for plaster and plasterboard.

Hydrated calcium sulfate (CaSO4.2H20), mainly used as a soil conditioner. Either mined from natural sources or produced as a by-product of the manufacture of phosphoric acid, the latter being known as phosphogypsum.

hydrated sulphate of lime, a comparatively soft mineral found in Yorkshire along the west side of the vale of York. On rehydration after heating it will set hard.

is hydrous calcium sulfate. It is a common mineral used as an ingredient in many casting materials, including Plaster of Paris. It can be made weather resistant by formulating it with cement and other chemicals.

Natural crystalline calcium sulphate used as an extender pigment in paint, and in the manufacture of gypsum wallboard and plaster of Paris.

a mineral found in rocks. Its chemical formula is CaSO.2H O, calcium sulphate.

a mineral composed of hydrated calcium sulfate: CaSO4.2H2O

Mineral composed of calcium sulfate, typically produced in hyper-saline basins characterized by the evaporation of water that causes concentration of salts.

a chalk-like mineral; essentially a hydrous sulphate of calcium (CaSO42H2O)..

gypsum is made of calcium sulfate and is one of the more beautiful mineral decorations. The snowy white gypsum can grow in swordlike needles (up to 30 inches), flower shapes, tendrils, or sheets covering ceilings, walls, or floors.

Hydrated Calcium Sulphate. Can form when limestone is attacked by sulphuric acid. The resulting product is larger than its components so can be 'squirted' through pores in the rock under pressure, whilst in crystalline form

a widely distributed mineral consisting of hydrous calcium sulfate that is used especially as a soil amendment and in making plaster of paris

Hydrated calcium sulphate, a mineral often appearing as outward-curving petal-like "flowers." The rock, softer and more soluble than limestone, is sometimes massive enough to permit cave formation.

A mineral (calcium sulfate) that, after processing, forms the core of drywall panels.

Sedimentary evaporate mineral. Hydrated Calcium sulfate. Clear, white to brown. (2)

Caleium sulfate. Yellow prussiate of potash Potassium ferrocyanide.

A soft mineral consisting of hydrous calcium sulfate

A common mineral sometimes added to water to make it simulate high-quality British brewing water.

A soft, white mineral composed of hydrous sulfate of lime. It is used as plaster of Paris.

A fireproof board composed of calcium sulphate and fibers. Used as construction panels.

Calcium sulfate dihydrate, CaSO4.2H2O added to cement to regulate setting.

A natural inert pigment consisting essentially of a hydrated form of calcium sulphate. When heated to remove a part of the water of hydration, "plaster of Paris" is formed. Further heating to remove all of the water of hydration produces calcium sulphate, which does not react with water to form a solid "set material" as does plaster of Paris.

Hydrous calcium sulfate. The main component of sheetrock or drywall.

The most common sulfate mineral. Used in wallboard.

Hydrated calcium sulfate used in the treatment of soft water or neutral water to soften it.

Crystals of native sulphate of lime. Being subjected to a moderate heat to expel the water of crystallisation, it forms plaster of Paris, and coming in contact with water immediately assumes a solid form. Of the numerous species, alabaster is perhaps the most abundant.

(CaSO4 2H2O) A moderately insoluable calcium sulfate, containing 20.9 percent water, which is often used as a soil amendment to aid in building soil structure and permeability.

A hydrated sulfite of calcium, used to make plaster of Paris, to treat soil, or as the core for drywall.

a mineral used to make fertilizer and plaster of Paris; hydrous calcium sulfate. Alabaster is one form of gypsum. [AHDOS

Gypsum is a very soft mineral composed of calcium sulfate dihydrate, with the chemical formula CaSO4·2H2O.