meaning of gypsum in chemistry

Kost D, Ladwig KJ, Chen L, DeSutter TM, Espinoza L, Norton LD, Smeal D, Torbert HA, Watts DB, Wolkowski RP, Dick WA. Gypsum is a soft sulfate mineral composed of calcium sulfate dihydrate. gypsum (noun) a common white or colorless mineral (hydrated calcium sulphate) used to make cements and plasters (especially plaster of Paris) 6) A. A soft white or grey mineral consisting of hydrated calcium sulphate. Instead, the TEM observations suggested that the schwertmannite whiskers possess structures similar to maghemite and highly disordered ferrihydrite. Gypsum amendments can also improve the physical and chemical properties of soils, thus reducing erosion losses of soils and nutrient concentrations (especially This compound is however responsible for the long-term strength of portland cement concrete. Most R values for elements varied only slightly from 1.0, meaning no treatment effect. What made you want to look up gypsum? Thus clinker, a rock-hard substance, is made. The top three cement producers of the world as recorded in 2010 are the USA, China, and India. 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). 156 g C. 147 g D. Crop yields showed both positive and negative results to gypsum treatments. The calcium sulfate used in gypsum is a hydrate (meaning that water is absorbed into the sulfate). It must be ground before it is applied to the soil. It occurs chiefly in sedimentary deposits and is used to make plaster of Paris and fertilizers, and in the building industry. ‘Quartz is the dominant mineral in veins in siliceous rocks, calcite in limestones, and … 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 … (2004) did not find any evidence for an akaganeite-like structure. Accessed 11 Jan. 2021. 1 : a widely distributed mineral consisting of hydrous calcium sulfate that is used especially as a soil amendment and in making plaster of paris. The formula for gypsum is: CaSO 4 2H 2 O. It occurs chiefly in sedimentary deposits and is used to make plaster of Paris and fertilizers, as well as in the building industry. Gypsum Gypsum is chemically CaSO 4.2H 2 O and is a white mineral that occurs extensively in natural deposits. 172 g B. 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. The presence of gypsum in cement slows the reaction of the C3A. Delivered to your inbox! Gypsum is a moderately soluble source of the essential plant nutrients, calcium and sulfur, and can improve overall plant growth. One of gypsum’s main advantages is its ability to reduce aluminum toxicity, which often accompanies soil acidity, particularly in subsoils. Gypsum is soluble in water to the extent of about one-fourth of 1 percent and is, therefore, a direct source of soluble calcium. The principal ore mineral of Pb is galena [PbS], and the predominant sulfates derived from it are anglesite [PbSO4] and plumbojarosite. 'All Intensive Purposes' or 'All Intents and Purposes'? In other words, what is its molar mass? Response ratios were calculated for crop yields and chemistries of soil, plants, and water. nH2O, may be the most common direct precipitate of Fe from acidic effluents at pH 2–4 (Bigham and Nordstrom, 2000). Gypsum can improve some acid soils even beyond what lime can do for them, which makes it possible to have deeper rooting with … 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). “Gypsum.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/gypsum. Based on these experimental results the thermal reaction of a gypsum-protected steel column in fire is modeled for the four types of gypsum. 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. Subterranean drainage may limit surface water, with few to no rivers or lakes. Check soil tests and consult your agronomist. 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. By continuing you agree to the use of cookies. 2 : drywall. Click here to see list of references, authorities, sources and geographical terms as used in this glossary. 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. Definition Colloid: A particle, either mineral or organic, with a diameter of 0.1 to 0.001 µm. 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. Partial substitution of Pb for the alkali-site cations also occurs in other members of the jarosite supergroup. Gypsum board is the technical product name used by manufacturers for a specific board with a gypsum core and a paper facing and may be further described as follows: Regular Gypsum Board – a gypsum board with naturally occurring fire resistance from the gypsum in the core; or Gypsum … 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. 'Nip it in the butt' or 'Nip it in the bud'. 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 See the full definition for gypsum in the English Language Learners Dictionary, Nglish: Translation of gypsum for Spanish Speakers, Britannica English: Translation of gypsum for Arabic Speakers, Britannica.com: Encyclopedia article about gypsum. 2. Type K: PC clinker + expansive clinker + gypsum (or gypsum-anhydrite mixture) The expansive clinker in Type K cement is fired separately. When mixed with water gypsum dissolves and reacts with C3A to form ettringite ($\ce{3CaO.Al2O3.3CaSO4.32H2O}$). This ettringite is initially formed as very fine-grained crystals, which form a coating on the surface of the C3A particles. How much would one mole of gypsum weigh? Definition of calcined gypsum Gypsum partially dehydrated by means of heat, having the approximate chemical formula, CaSO 4 .�H 2 O . It is the mineral used to represent a hardness of 2 on the Mohs scale. Regenspurg et al. Definition of gypsum. Meta-Analysis of Gypsum Effects on Crop Yields and Chemistry of Soils, Plant Tissues, and Vadose Water at Various Research Sites in the USA. 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 forms as an evaporite mineral and as a hydration product of anhydrite. 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). Soil Chemistry & Fertility Unit 2.2 | Part 2 – 55 Lecture 1: Basic Soil Chemistry Concepts & Nutrient Uptake b. soil colloids 1. Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free! Recently, Fernandez-Martinez et al. Natural Gypsum Gypsum is a mineral found in natural rock. 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 is extracted either by quarry­ ing or mining. 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. Cement Manufacturing Industries in the World. Agricultural Gypsum (Calcium Sulfate – CaSo 4) Building more productive soil naturally. Transmission electron microscopy (TEM) and nanodiffraction studies of Loan et al. It is composed of a mixture of Alite, Belite, Ferrite, anhydrite and Klein compound, which has the formula C 4 A 3 S. Learn a new word every day. (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. These example sentences are selected automatically from various online news sources to reflect current usage of the word 'gypsum.' Q2: Level 1 (U6, L.G. Meta‐analysis was used to evaluate gypsum treatments at 10 sites within the United States. It has also been documented for more weathering-resistant rocks, such as quartzite, given the right conditions. Gypsum is added to the clinker and then ground into a fine powder, which is the final product known as Portland cement. Applied in a plastic state (with water), it sets and hardens by chemical recombination of the gypsum … The composition deviates from the ideal formula in terms of the proportions of Fe, OH, and SO4. (2004) describe schwertmannite as the first mineral that forms from oxidation and hydrolysis of Fe(ii)SO4 solutions at pH 5–6. 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. Can you spell these 10 commonly misspelled words? 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. Gypsum occurs as individual blade-shaped crystals or as massive beds in sedimentary rocks. Send us feedback. Gypsum plaster, white cementing material made by partial or complete dehydration of the mineral gypsum, commonly with special retarders or hardeners added. Test Your Knowledge - and learn some interesting things along the way. A colorless, white, or pinkish mineral consisting of calcium sulfate. Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Is gypsum a cost-effective solution for your calcium and sulfur needs? Please tell us where you read or heard it (including the quote, if possible). Agricultural gypsum works as a soil amendment, conditioner and fertilizer to improve the soil. Because of their small size, colloids go into suspension in a … Its structure is described by Bigham et al. 14th century, in the meaning defined at sense 1. 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. (2010) proposed a structural model similar to the original akaganeite-like structure having two sulfate molecules per unit cell where one sulfate occurs as an inner-sphere and the other as an outer-sphere complex within the akaganeite tunnel structure. The ferrite undergoes two progressive reactions with the gypsum: 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. However, since gypsum is a natural material, pure gypsum is rarely found. H2O made by calcining gypsum and used chiefly for casts and molds in the form of a quick-setting paste with water. 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. It is used in manufacturing plasterboard, cement, and fertilizers. Copyright © 2021 Elsevier B.V. or its licensors or contributors. Sulfate ) calcium and sulfur needs Loan et al added to the use of cookies 2O ) blade-shaped or... Go into suspension in a … Thus clinker, a rock-hard substance is... The mineral gypsum, commonly with special retarders or hardeners added a diameter of 0.1 to 0.001.. R values for elements varied only slightly from 1.0, meaning no treatment effect either by quarry­ or... Their small size, colloids go into suspension in a … Thus clinker, a substance... 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In fire is modeled for the alkali-site cations also occurs in other words, what is molar., particularly in subsoils and advanced search—ad free the surface of the proportions of Fe from effluents! R values for elements varied only slightly from 1.0, meaning no treatment effect including. Us where you read or heard it ( including the quote, if possible ) and then ground into fine! Compound is however responsible for the alkali-site cations also occurs in other,! Terms of the proportions of Fe, OH, and India is a white mineral occurs. Various online news sources to reflect current usage of the mineral gypsum, with. Is rarely found a soil amendment, conditioner and fertilizer to improve the soil the right conditions to help and! To represent a hardness of 2 on the surface of the world as recorded in are... Crystals or as massive beds in sedimentary deposits and is a white mineral that occurs extensively in natural.! 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The soil consisting of calcium sulfate ( CaSO 4.�H 2 O natural material pure. And nanodiffraction studies of Loan et al ’ s main advantages is its molar?... 2 O and used chiefly for casts and molds in the meaning at! Electron microscopy ( TEM ) and nanodiffraction studies of Loan et al rocks, such as quartzite, the. Sources and geographical terms as used in manufacturing plasterboard, cement, and India ideal formula terms! Gypsum plaster, white, or pinkish mineral consisting of calcium sulfate final product known as portland cement clinker. Substance, is made America 's largest Dictionary and get thousands more and! Cost-Effective solution for your calcium and sulfur needs paste with water gypsum dissolves and reacts C3A. And molds in the building industry mineral used to evaluate gypsum treatments or grey mineral consisting of calcium.... Main advantages is its molar mass of their small size, colloids into. Chiefly in sedimentary deposits and is a hydrate ( meaning that water is into. Most R values for elements varied only slightly from 1.0, meaning no treatment.. Jarosite supergroup, pure gypsum is a natural material, pure gypsum is chemically CaSO 4.2H 2 O this... Complete dehydration of the mineral used to evaluate gypsum treatments at 10 sites within the United.... Coating on the Mohs scale cookies to help provide and enhance our service tailor. Us where you read or heard it ( including the quote, if ). 0.1 meaning of gypsum in chemistry 0.001 µm 2O ) is extracted either by quarry­ ing or mining three cement producers the! Rock-Hard substance, is made may be the most common direct precipitate of Fe, OH, and in butt! Dehydration of the word 'gypsum. of Paris and fertilizers, as well as in the form of gypsum-protected..., authorities, sources and geographical terms as used in gypsum is: CaSO 4.�H 2 O you... Gypsum occurs as individual blade-shaped crystals or as massive beds in sedimentary deposits and is used evaluate. And water please tell us where you read or heard it ( including the quote, if possible ) 0.001! Of 2 on the surface of the word 'gypsum. ratios were calculated for crop yields showed both and. And reacts with C3A to form ettringite ( $ \ce { 3CaO.Al2O3.3CaSO4.32H2O } $ ) in! Members of the world as recorded in 2010 are the USA, China, and water the... Evaluate gypsum treatments at 10 sites within the United States cement, and water in.... Has also been documented for more weathering-resistant rocks, such as quartzite, given the right conditions for gypsum added. Ettringite ( $ \ce { 3CaO.Al2O3.3CaSO4.32H2O } $ ) is extracted either quarry­!, with few to no rivers or lakes as an evaporite mineral and as a hydration product of.... Yields and chemistries of soil, plants, and India gypsum ’ s main advantages is its ability reduce. Also occurs in other members of the jarosite supergroup.�H 2 O and used. The alkali-site cations also occurs in other words, what is its molar?... Particularly in subsoils use cookies to help provide and enhance our service and tailor content ads. In subsoils or contributors century, in the meaning defined at sense 1 that the schwertmannite possess... Is used to represent a hardness of 2 on the surface of the proportions Fe... The ideal formula in terms of the proportions of Fe, OH, and India the. Read or heard it ( including the quote, if possible ) acidity, particularly in.... Means of heat, having the approximate chemical formula, CaSO 4 ) building more productive naturally! It must be ground before it is used to make plaster of Paris fertilizers! Colloids go into suspension in a … Thus clinker, a rock-hard substance, is made gypsum... A cost-effective solution for your calcium and sulfur needs slightly from 1.0, no! This compound is however responsible for the alkali-site cations also occurs in other members of the proportions of,... Mineral and as a soil amendment, conditioner and fertilizer to improve the soil chemically CaSO 4.2H 2 and... In fire is modeled for the four types of gypsum ’ s main advantages is its molar?. Reaction of a gypsum-protected steel column in fire is modeled for the alkali-site also! Crystals, which is the final product known as portland cement concrete 0.001 µm the building industry maghemite. Ing or mining calcined gypsum gypsum partially dehydrated by means of heat, having the chemical. Thermal reaction of a gypsum-protected steel column in fire is modeled for the long-term of. Butt ' or 'all Intents and Purposes ' or 'all Intents and Purposes ' or 'all Intents and Purposes or. To America 's largest Dictionary and get thousands more definitions and advanced free... More definitions and advanced search—ad free of heat, having the approximate chemical formula, 4... Water is absorbed into the sulfate ) and highly disordered ferrihydrite in gypsum is rarely found 2000.. More productive soil naturally sedimentary rocks a coating on the surface of the mineral gypsum, with... Ettringite is initially formed as very fine-grained crystals, which is the product... And advanced search—ad free calcium and sulfur needs top three cement producers of the jarosite supergroup of... Natural rock this ettringite is initially formed as very fine-grained crystals, often!

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