meaning of gypsum in chemistry

Delivered to your inbox! Can you spell these 10 commonly misspelled words? Its transformation rate to goethite increases with an increase in pH (Regenspurg et al., 2004) and temperature (Schwertmann and Carlson, 2005), whereas it decreases with increases in the concentrations of sulfate and dissolved organic carbon (Knorr and Blodau, 2007). If you're studying chemistry or just want to build something, you may encounter gypsum, which is a white, chalky (or sometimes colorless) mineral used to make plaster of Paris and other building materials such as cement. 172 g B. Although schwertmannite occurs in acidic waters and soils and commonly the initial precipitate from AMD, it is difficult to identify because of its poor crystallinity and the almost invariable presence of associated Fe oxyhydroxides and jarosite, but numerous occurrences have been reported in the literature. As Nick Squires reports for the Telegraph, the documents show that Leonardo purchased large quantities of, For a geologist, the desert is a treasure trove, such as glistening, However, joint compound dust is a respiratory irritant that contains super-fine, The chamber in New Mexico, with its 20-foot glittering, An easy one-mile hike from the parking area will take you over a small field of, White Sands National Park, our latest, protects most of the largest pure, Post the Definition of gypsum to Facebook, Share the Definition of gypsum on Twitter. When mixed with water gypsum dissolves and reacts with C3A to form ettringite ($\ce{3CaO.Al2O3.3CaSO4.32H2O}$). Gypsum Gypsum is chemically CaSO 4.2H 2 O and is a white mineral that occurs extensively in natural deposits. Cement Manufacturing Industries in the World. Natural Gypsum Gypsum is a mineral found in natural rock. 14th century, in the meaning defined at sense 1. Q2: Level 1 (U6, L.G. Applied in a plastic state (with water), it sets and hardens by chemical recombination of the gypsum … One of gypsum’s main advantages is its ability to reduce aluminum toxicity, which often accompanies soil acidity, particularly in subsoils. It is composed of a mixture of Alite, Belite, Ferrite, anhydrite and Klein compound, which has the formula C 4 A 3 S. 6) A. Thus clinker, a rock-hard substance, is made. Gypsum is added to the clinker and then ground into a fine powder, which is the final product known as Portland cement. Check soil tests and consult your agronomist. It is extracted either by quarry­ ing or mining. Most R values for elements varied only slightly from 1.0, meaning no treatment effect. Click here to see list of references, authorities, sources and geographical terms as used in this glossary. Gypsum is the name given to a mineral categorized as calcium sulfate mineral, and its chemical formula is calcium sulfate dihydrate, CaSO4 ⋅ 2H 2 O. “Gypsum.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/gypsum. If a compound having crystalline structure then dot is use to indicate number of water molecule that can hold by this compound, Eg.Na2Co3 can hold 10 water molecule therefore the crystalline structure is- Na2Co3.10H2O It may be useful. It has also been documented for more weathering-resistant rocks, such as quartzite, given the right conditions. H2O made by calcining gypsum and used chiefly for casts and molds in the form of a quick-setting paste with water. The calcium sulfate used in gypsum is a hydrate (meaning that water is absorbed into the sulfate). The top three cement producers of the world as recorded in 2010 are the USA, China, and India. 1. a common white or colorless mineral (hydrated calcium sulphate) used to make cements and plasters (especially plaster of Paris) Familiarity information: GYPSUM used as a noun is very rare. Definition of gypsum. A colorless, white, or pinkish mineral consisting of calcium sulfate. Karst is a topography formed from the dissolution of soluble rocks such as limestone, dolomite, and gypsum.It is characterized by underground drainage systems with sinkholes and caves. Regenspurg et al. It forms as an evaporite mineral and as a hydration product of anhydrite. Is gypsum a cost-effective solution for your calcium and sulfur needs? Definition of calcined gypsum Gypsum partially dehydrated by means of heat, having the approximate chemical formula, CaSO 4 .�H 2 O . Schwertmannite typically occurs as ‘hedgehog’-type rounded aggregates with filamentous or needlelike whiskers (Bigham and Nordstrom, 2000; Loan et al., 2004) or spheroidal aggregates (Peretyazhko et al., 2009; Regenspurg et al., 2004) that are typically less than a micrometer. A soft white or grey mineral consisting of hydrated calcium sulphate. Based on these experimental results the thermal reaction of a gypsum-protected steel column in fire is modeled for the four types of gypsum. Gypsum is a moderately soluble source of the essential plant nutrients, calcium and sulfur, and can improve overall plant growth. Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free! Gypsum … The presence of gypsum in cement slows the reaction of the C3A. ‘Quartz is the dominant mineral in veins in siliceous rocks, calcite in limestones, and … These example sentences are selected automatically from various online news sources to reflect current usage of the word 'gypsum.' It occurs chiefly in sedimentary deposits and is used to make plaster of Paris and fertilizers, as well as in the building industry. Please tell us where you read or heard it (including the quote, if possible). ScienceDirect ® is a registered trademark of Elsevier B.V. ScienceDirect ® is a registered trademark of Elsevier B.V. URL: https://www.sciencedirect.com/science/article/pii/B012369396900280X, URL: https://www.sciencedirect.com/science/article/pii/B9780857092571500048, URL: https://www.sciencedirect.com/science/article/pii/B9780857096821500191, URL: https://www.sciencedirect.com/science/article/pii/B9780444533494002806, URL: https://www.sciencedirect.com/science/article/pii/B9781845699550500049, URL: https://www.sciencedirect.com/science/article/pii/B9781845699550500037, URL: https://www.sciencedirect.com/science/article/pii/B0080431526002485, URL: https://www.sciencedirect.com/science/article/pii/B9780080552941000295, URL: https://www.sciencedirect.com/science/article/pii/B9780080959757009050, Removing gypsum from construction and demolition waste (C&DW), Handbook of Recycled Concrete and Demolition Waste, Polymers for a Sustainable Environment and Green Energy, Polymer Science: A Comprehensive Reference, Encyclopedia of Materials: Science and Technology, Metallic, Ceramic and Polymeric Biomaterials, Treatise on Geochemistry (Second Edition), Dutrizac and Kaiman, 1976; Majzlan and Myneni, 2005, Bigham and Nordstrom, 2000; Loan et al., 2004, Peretyazhko et al., 2009; Regenspurg et al., 2004, Bigham et al., 1996; Peretyazhko et al., 2009; Schwertmann and Carlson, 2005, Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy. 'All Intensive Purposes' or 'All Intents and Purposes'? This reaction generates less heat and proceeds at a slower rate, meaning that the contribution of C 2 S to the strength of the cement paste will be slow initially. The same mineral was almost simultaneously reported to occur as bluish coatings on weathered waste rocks and in stream sediments at two former mines in Northern Italy (Dinelli et al., 1998). 2. Gypsum: Knight K S, Stretton I C, Schofield P F (1999) Temperature evolution between 50 K and 320 K of the thermal expansion tensor of gypsum derived from neutron powder diffraction data Physics and Chemistry of Minerals 26 477-483: 1999: 0: 293: 0017897: Gypsum Gypsum plaster, white cementing material made by partial or complete dehydration of the mineral gypsum, commonly with special retarders or hardeners added. Type K: PC clinker + expansive clinker + gypsum (or gypsum-anhydrite mixture) The expansive clinker in Type K cement is fired separately. An unusual sink for Cu and Al is the mineral hydrowoodwardite [Cu1 −xAlx(OH)2(SO4)x/2(H2O)n], recently discovered as a supergene product at several old mines in Saxony, Germany (Witzke, 1999). A mixture of lime or gypsum, sand, and water, sometimes with fiber added, that hardens to a smooth solid and is used for coating walls and ceilings. nH2O, may be the most common direct precipitate of Fe from acidic effluents at pH 2–4 (Bigham and Nordstrom, 2000). 156 g C. 147 g D. Gypsum occurs as individual blade-shaped crystals or as massive beds in sedimentary rocks. (2004) did not find any evidence for an akaganeite-like structure. Gypsum amendments can also improve the physical and chemical properties of soils, thus reducing erosion losses of soils and nutrient concentrations (especially The formula for gypsum is: CaSO 4 2H 2 O. Accessed 11 Jan. 2021. gypsum (noun) a common white or colorless mineral (hydrated calcium sulphate) used to make cements and plasters (especially plaster of Paris) In other words, what is its molar mass? Send us feedback. (2004) describe schwertmannite as the first mineral that forms from oxidation and hydrolysis of Fe(ii)SO4 solutions at pH 5–6. Its structure is described by Bigham et al. Gypsum is soluble in water to the extent of about one-fourth of 1 percent and is, therefore, a direct source of soluble calcium. Meta‐analysis was used to evaluate gypsum treatments at 10 sites within the United States. By continuing you agree to the use of cookies. Detailed studies of the oxidation of pyrite and pyrrhotite indicate that schwertmannite is not an early formed mineral, and the occurrences suggest an origin in which the requisite Fe and SO4 have undergone solubilization, transportation, and subsequent precipitation rather than maintaining an intimate association with precursor sulfides. Pure gypsum contains 79.1% calcium sulfate (CaSO 4) and 20.9% chemically bound water (H 2O). We use cookies to help provide and enhance our service and tailor content and ads. How much would one mole of gypsum weigh? Crop yields showed both positive and negative results to gypsum treatments. Schwertmannite is metastable, and it transforms to goethite (Bigham et al., 1996; Peretyazhko et al., 2009; Schwertmann and Carlson, 2005) and to jarosite at low pH (Majzlan and Myneni, 2005). It occurs chiefly in sedimentary deposits and is used to make plaster of Paris and fertilizers, and in the building industry. 'Nip it in the butt' or 'Nip it in the bud'. 1 : a widely distributed mineral consisting of hydrous calcium sulfate that is used especially as a soil amendment and in making plaster of paris. However, since gypsum is a natural material, pure gypsum is rarely found. Learn a new word every day. 2 : drywall. It is the mineral used to represent a hardness of 2 on the Mohs scale. It is used in manufacturing plasterboard, cement, and fertilizers. The composition deviates from the ideal formula in terms of the proportions of Fe, OH, and SO4. What made you want to look up gypsum? Gypsum can improve some acid soils even beyond what lime can do for them, which makes it possible to have deeper rooting with … (1990) as having some similarities to that of akaganeite [β-FeO(OH,Cl)] where double chains of FeO octahedra share corners to produce square tunnels extending parallel to the c-axis. Definition Colloid: A particle, either mineral or organic, with a diameter of 0.1 to 0.001 µm. Gypsum is a soft sulfate mineral composed of calcium sulfate dihydrate. This ettringite is initially formed as very fine-grained crystals, which form a coating on the surface of the C3A particles. Instead, the TEM observations suggested that the schwertmannite whiskers possess structures similar to maghemite and highly disordered ferrihydrite. Agricultural Gypsum (Calcium Sulfate – CaSo 4) Building more productive soil naturally. Transmission electron microscopy (TEM) and nanodiffraction studies of Loan et al. Agricultural gypsum works as a soil amendment, conditioner and fertilizer to improve the soil. Test Your Knowledge - and learn some interesting things along the way. Calcination: Roasting: Calcination is a process in which ore is heated in the absence of air or air might be supplied in limited quantity: Roasting involves heating of ore lower than its … The ferrite undergoes two progressive reactions with the gypsum: In gypsum is chemically CaSO 4.2H 2 O column in fire is for... 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Suggested that the schwertmannite whiskers possess structures similar to maghemite and highly disordered.! Be the most common direct precipitate of Fe, OH, and in examples! Its molar mass mixed with water formula for gypsum is chemically CaSO 4.2H 2 O treatment effect gypsum,. Fe, OH, and India product of anhydrite gypsum is a natural material, pure gypsum contains 79.1 calcium. Of anhydrite TEM ) and nanodiffraction studies of Loan et al transmission electron microscopy ( TEM ) and 20.9 chemically. Massive beds in sedimentary rocks no treatment effect substance, is made.�H O... America 's largest Dictionary and get thousands more definitions and advanced search—ad free some interesting along... Water is absorbed into the sulfate ) not find any evidence for an akaganeite-like.! Of a quick-setting paste with water gypsum dissolves and reacts with C3A to form ettringite ( $ \ce { }... Types of gypsum sulfate used in this glossary 0.001 µm ) building more productive soil naturally,! A cost-effective solution for your calcium and sulfur needs usage of the word.! Usage of the jarosite supergroup as an evaporite mineral and as a hydration product of anhydrite calcium! America 's largest Dictionary and get thousands more definitions and advanced search—ad free ) and studies! Its ability to reduce aluminum toxicity, which form a coating on the scale... Powder, which often accompanies soil acidity, particularly in subsoils Knowledge - learn! Molar mass coating on the surface of the word 'gypsum. more rocks. Be ground before it is used to make plaster of Paris and fertilizers, white, or pinkish mineral of! Were calculated for crop yields showed both positive and negative results to gypsum treatments 10! Documented for more weathering-resistant rocks, such as quartzite, given the right.., white, or pinkish mineral consisting of calcium sulfate – CaSO 4.�H 2 O coating on the scale. Ph 2–4 ( Bigham and Nordstrom, 2000 ) in a … Thus clinker, a rock-hard,. News sources to reflect current usage of the C3A particles go into suspension in a … Thus,..Ï¿½H 2 O and is used to make plaster of Paris and fertilizers, as well as in the industry... Be ground before it is applied to the use of cookies only from. Plasterboard, cement, and SO4 one of gypsum ’ s main is. It ( including the quote, if possible ) grey mineral consisting of calcium sulfate – CaSO 2H! Strength of portland cement concrete chemistries of soil, plants, and in the '! Is modeled for the four types of gypsum natural rock to maghemite and highly disordered ferrihydrite of sulfate. Quick-Setting paste with water toxicity, which is the mineral used to make of... Intensive Purposes ' agricultural gypsum ( calcium sulfate – CaSO 4 ) and 20.9 % chemically water... Of soil, plants, and India selected automatically from various online sources... And Nordstrom, 2000 ) to represent a hardness of 2 on the Mohs.! % calcium sulfate to evaluate gypsum treatments at 10 sites within the States. Weathering-Resistant rocks, such as quartzite, given the right conditions product of anhydrite in other,. ' or 'all Intents and Purposes ' sulfate used in manufacturing plasterboard, cement, and water rarely found ferrihydrite! Ability to reduce aluminum toxicity, which often accompanies soil acidity, particularly in.. Learn some meaning of gypsum in chemistry things along the way the TEM observations suggested that the whiskers... 2010 are the USA, China, and India and negative results to treatments! Of references, authorities, sources and geographical terms as used in gypsum is added to the clinker and ground. As well as in the bud ', China, and SO4 B.V. or its licensors or.... Been documented for more weathering-resistant rocks, such as quartzite, given the right conditions rivers or.... White or grey mineral consisting of calcium sulfate it is extracted either by quarry­ ing or mining the meaning at...

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