Gypsum formula

Gypsum is calcium sulfate (CaSO 4). Refined gypsum in the anhydrite form (no water) is 29.4 percent calcium (Ca) and 23.5 percent sulfur (S). Usually, gypsum has water associated in the molecular structure (CaSO 4·2H2O) and is approximately 23.3 percent Ca and 18.5 percent S (plaster of paris). Gypsum fertilizer usually has other impurities so grades are approximately 22 percent Ca and 17 percent S. Gypsum is sparingly soluble (the reason wallboard gets soft but does not immediately dissolve when it gets wet, at least if only damp occasionally). Gypsum is the neutral salt of a strong acid and strong base and does not increase or decrease acidity. Dissolving gypsum in water or soil results in the following reaction: CaSO 4·2H 2O = Ca 2+ + SO 42- + 2H 2O. It adds calcium ions (Ca 2+) and sulfate ions (SO 42-), but does not add or take away hydrogen ions (H+). Therefore, it does not act as a liming or acidifying material. The Ca 2+ ions simply interact with exchange sites in soil and sulfate remains dissolved in soil water. Gypsum as a fertilizer? Gypsum is a fertilizer product and supplies the crop-available form of calcium (Ca 2+) and sulfur (SO 42-). If these forms are deficient in soil, then crop productivity will benefit if gypsum is applied. This is a big "if" for Iowa soils. Research has not shown deficiency of Ca and normally any potential problem with low Ca levels is taken care of with application of limestone (CaCO3). Acidity problems will occur before a deficiency...

General Gypsum Information Chemical Formula: CaSO4•2(H2O) Composition: Molecular Weight = 172.17 gm 2O 3 ____________ 100.00%100.00%=TOTALOXIDE Empirical Formula: Ca(SO 4)•2(H 2O) Environment: Sedimentary evaporite deposits. IMA Status: Valid Species (Pre-IMA) Prehistoric Locality: Numerous localities worldwide. Naica, Chihuahua, Mexico. Link to Name Origin: From the Greek, gyps meaning "burned" mineral. Selenite from the Greek in allusion to its pearly luster (moon light) on cleavage fragments. Name Pronunciation: Gypsum Synonym: Alabaster ICSD 2057 PDF 33-311 Satin Spar Selenite Gypsum Image Images: Comments: Bladed rosettes of gypsum. Location: unknown. Scale: Specimen size 6 cm. © Dave Barthelmy Images: Comments: Pencil-sized acicular crystals of gypsum. Location: Naica, Chihuahua, S.A., Mexico. Scale: Specimen size 5 cm. © Dave Barthelmy Gypsum Crystallography Axial Ratios: a:b:c =0.3741:1:0.4143 Cell Dimensions: a = 5.68, b = 15.18, c = 6.29, Z = 4; beta = 113.833° V = 496.09 Den(Calc)= 2.31 Crystal System: Monoclinic - PrismaticH-M Symbol (2/m) Space Group: A2/a X Ray Diffraction: By Intensity(I/I o): Forms: Mouse Dbl Clk - Start-Stop Rotation RMB - Cycle Display Modes Drag1 - Manipulate Crystal Drag2 - Resize Keyboard S - Stereo I - Indicies - Start-Stop Rotation F - Fit to Screen M - Menu Forms: ( 0 1 0) ( 1 1 1) ( 1 2 0) Warning: this large pop-up is very compute intensive and may not work well with some computers. Crystal Structure: Mouse drag1 - LMB Manipulate...

gypsum GYPSUM During the Paleozoic Era, beginning about 600 million years ago and ending about 230 million years ago, seawater invaded the Michigan Basin at least six times. As the seas receded and evaporated, rock and mineral deposits such as halite (rock salt), gypsum (calcium sulfate with water), liquid brines, petroleum, lime, clay, sandstone and coal were left behind. The fifth of these seas, the Mississippian, was responsible for Michigan’s gypsum deposits, which are among the richest in the world. Gypsum is a non-metallic mineral, found in rock form. It is composed of 79.1% calcium sulphate and 20.9% water, by weight. Chemists call it Hydrous Calcium Sulphate, and as there is one molecule of calcium sulphate combined with two molecules of water. It has the chemical formula CaSO 42H 20. By volume this works out to nearly 50% water in the mineral structure. This water however, is perfectly dry, and is known as "water of crystalization". It could be compared with ice, which, too is water in crystaline form, but there is this an important difference; ice will melt, or change to water, when it is exposed to a to temperature above 32 F. Water of crystalization, in gypsum, does not change until it is subjected to heat above 212 F but at that temperature the water of crystalization changes form and becomes water vapor and is driven off from the gypsum just as steam is driven off from water at 212 F. Gypsum, an 4 H 2O deposits behind, as gypsum. In absolutely pure form, gyps...

Production and properties [ ] Phosphogypsum is a by-product from the production of Ca 5(PO 4) 3X + 5 H 2SO 4 + 10 H 2O → 3 H 3PO 4 + 5 (CaSO 4 · 2 H 2O) + HX where X may include OH, F, Cl, or Br Phosphogypsum is radioactive due to the presence of naturally occurring Use [ ] Various applications have been proposed for using phosphogypsum, including using it as material for: • • Cover for • • • According to Taylor (2009), "up to 15% of world PG production is used to make building materials, as a soil amendment and as a set controller in the manufacture of In the United States [ ] The 226Ra concentration of greater than 10 [ citation needed]. Given the traditional definition of the Curie via the 226 Ra, this limit is equivalent to 0.01 milligrams (0.00015gr) of radium per metric ton or a concentration of 10 parts per trillion. (See EPA approved the use of phosphogypsum for road construction during the The state of Florida has approximately 80% of the world's phosphogypsum production capacity. In May 2023, the Florida legislature passed a bill requiring the In China [ ] China's phosphate fertilizer production exceeded that of the US in 2005, and with it came the problem of excess phosphogypsum. By 2018, inappropriate storage has become a major problem in the The construction industry is the number one user of phosphogypsum in 2020, with 10.5 Mt used as concrete set retarder and 3.5 Mt used in Phosphogypsum may require pre-processing to remove contaminants before use. Phosphoru...

Gypsum • Gypsum is a non-toxic mineral which is widely used sulfate. • Calcium sulfate dihydrate is chemically represented as CaSO 4 . 2 H 2 O. • It is made up of water, calcium sulfate, and oxygen. • It is useful to animals, humans and plants. • Gypsum rock is found worldwide and deposits extends from Baja, Mexico across uttah and from southwest Texas to the Niagra river in New york. Therefore, the chemical name of Gypsum is CaSO 4 . 2 H 2 O.

Gypsum: Satin spar, a fibrous variety of gypsum from Derbyshire, England. Specimen is approximately 4 inches (10 centimeters) across. What is Gypsum? Gypsum is an evaporite mineral most commonly found in layered sedimentary deposits in association with 4 .2H 2O) is very similar to Anhydrite (CaSO 4). The chemical difference is that gypsum contains two waters and anhydrite is without water. Gypsum is the most common sulfate Physical Properties of Gypsum Chemical Classification Sulfate Color Clear, colorless, white, gray, yellow, red, brown Streak White Luster Vitreous, silky, sugary Diaphaneity Transparent to translucent Cleavage Perfect Mohs Hardness 2 Specific Gravity 2.3 Diagnostic Properties Cleavage, specific gravity, low hardness Chemical Composition Hydrous calcium sulfate, CaSO 4 .2H 2O Crystal System Monoclinic Uses Used to manufacture dry wall, plaster, joint compound. An agricultural soil treatment. Uses of Gypsum Gypsum uses include: manufacture of wallboard, cement, plaster of Paris, soil conditioning, a hardening retarder in portland cement. Varieties of gypsum known as "satin spar" and "alabaster" are used for a variety of ornamental purposes; however, their low