meaning of gypsum in chemistry

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Gypsum Gypsum is chemically CaSO 4.2H 2 O and is a white mineral that occurs extensively in natural deposits. This ettringite is initially formed as very fine-grained crystals, which form a coating on the surface of the C3A particles. These example sentences are selected automatically from various online news sources to reflect current usage of the word 'gypsum.' Definition of calcined gypsum Gypsum partially dehydrated by means of heat, having the approximate chemical formula, CaSO 4 .�H 2 O . 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. How much would one mole of gypsum weigh? It has also been documented for more weathering-resistant rocks, such as quartzite, given the right conditions. 156 g C. 147 g D. This compound is however responsible for the long-term strength of portland cement concrete. 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. Because of their small size, colloids go into suspension in a … Gypsum plaster, white cementing material made by partial or complete dehydration of the mineral gypsum, commonly with special retarders or hardeners added. Based on these experimental results the thermal reaction of a gypsum-protected steel column in fire is modeled for the four types of gypsum. Natural Gypsum Gypsum is a mineral found in natural rock. 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. Partial substitution of Pb for the alkali-site cations also occurs in other members of the jarosite supergroup. The formula for gypsum is: CaSO 4 2H 2 O. Gypsum is a soft sulfate mineral composed of calcium sulfate dihydrate. Agricultural Gypsum (Calcium Sulfate – CaSo 4) Building more productive soil naturally. Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free! Applied in a plastic state (with water), it sets and hardens by chemical recombination of the gypsum … (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. (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. Gypsum amendments can also improve the physical and chemical properties of soils, thus reducing erosion losses of soils and nutrient concentrations (especially Send us feedback. 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 … 2. Gypsum occurs as individual blade-shaped crystals or as massive beds in sedimentary rocks. The calcium sulfate used in gypsum is a hydrate (meaning that water is absorbed into the sulfate). It is the mineral used to represent a hardness of 2 on the Mohs scale. 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). 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 Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Delivered to your inbox! 172 g B. Thus clinker, a rock-hard substance, is made. 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. 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. What made you want to look up gypsum? “Gypsum.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/gypsum. Kost D, Ladwig KJ, Chen L, DeSutter TM, Espinoza L, Norton LD, Smeal D, Torbert HA, Watts DB, Wolkowski RP, Dick WA. 'All Intensive Purposes' or 'All Intents and Purposes'? It is used in manufacturing plasterboard, cement, and fertilizers. Meta‐analysis was used to evaluate gypsum treatments at 10 sites within the United States. Pure gypsum contains 79.1% calcium sulfate (CaSO 4) and 20.9% chemically bound water (H 2O). 2 : drywall. (2004) did not find any evidence for an akaganeite-like structure. ScienceDirect ® is a registered trademark of Elsevier B.V. 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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. Definition Colloid: A particle, either mineral or organic, with a diameter of 0.1 to 0.001 µm. It occurs chiefly in sedimentary deposits and is used to make plaster of Paris and fertilizers, as well as in the building industry. Transmission electron microscopy (TEM) and nanodiffraction studies of Loan et al. Response ratios were calculated for crop yields and chemistries of soil, plants, and water. We use cookies to help provide and enhance our service and tailor content and ads. 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. 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. One of gypsum’s main advantages is its ability to reduce aluminum toxicity, which often accompanies soil acidity, particularly in subsoils. 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. Gypsum can improve some acid soils even beyond what lime can do for them, which makes it possible to have deeper rooting with … gypsum (noun) a common white or colorless mineral (hydrated calcium sulphate) used to make cements and plasters (especially plaster of Paris) Is gypsum a cost-effective solution for your calcium and sulfur needs? Can you spell these 10 commonly misspelled words? Instead, the TEM observations suggested that the schwertmannite whiskers possess structures similar to maghemite and highly disordered ferrihydrite. The composition deviates from the ideal formula in terms of the proportions of Fe, OH, and SO4. Definition of gypsum. 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 Cement Manufacturing Industries in the World. Accessed 11 Jan. 2021. Copyright © 2021 Elsevier B.V. or its licensors or contributors. It occurs chiefly in sedimentary deposits and is used to make plaster of Paris and fertilizers, and in the building industry. The principal ore mineral of Pb is galena [PbS], and the predominant sulfates derived from it are anglesite [PbSO4] and plumbojarosite. H2O made by calcining gypsum and used chiefly for casts and molds in the form of a quick-setting paste with water. 1 : a widely distributed mineral consisting of hydrous calcium sulfate that is used especially as a soil amendment and in making plaster of paris. 14th century, in the meaning defined at sense 1. The presence of gypsum in cement slows the reaction of the C3A. It is extracted either by quarry­ ing or mining. 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). Crop yields showed both positive and negative results to gypsum treatments. Recently, Fernandez-Martinez et al. Meta-Analysis of Gypsum Effects on Crop Yields and Chemistry of Soils, Plant Tissues, and Vadose Water at Various Research Sites in the USA. 'Nip it in the butt' or 'Nip it in the bud'. When mixed with water gypsum dissolves and reacts with C3A to form ettringite ($\ce{3CaO.Al2O3.3CaSO4.32H2O}$). A soft white or grey mineral consisting of hydrated calcium sulphate. Gypsum is added to the clinker and then ground into a fine powder, which is the final product known as Portland cement. Most R values for elements varied only slightly from 1.0, meaning no treatment effect. 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. 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. nH2O, may be the most common direct precipitate of Fe from acidic effluents at pH 2–4 (Bigham and Nordstrom, 2000). 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). 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). Q2: Level 1 (U6, L.G. A colorless, white, or pinkish mineral consisting of calcium sulfate. Gypsum is a moderately soluble source of the essential plant nutrients, calcium and sulfur, and can improve overall plant growth. Its structure is described by Bigham et al. ‘Quartz is the dominant mineral in veins in siliceous rocks, calcite in limestones, and … It is composed of a mixture of Alite, Belite, Ferrite, anhydrite and Klein compound, which has the formula C 4 A 3 S. In other words, what is its molar mass? (2004) describe schwertmannite as the first mineral that forms from oxidation and hydrolysis of Fe(ii)SO4 solutions at pH 5–6. 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. However, since gypsum is a natural material, pure gypsum is rarely found. It forms as an evaporite mineral and as a hydration product of anhydrite. Click here to see list of references, authorities, sources and geographical terms as used in this glossary. The ferrite undergoes two progressive reactions with the gypsum: Test Your Knowledge - and learn some interesting things along the way. The top three cement producers of the world as recorded in 2010 are the USA, China, and India. Please tell us where you read or heard it (including the quote, if possible). Type K: PC clinker + expansive clinker + gypsum (or gypsum-anhydrite mixture) The expansive clinker in Type K cement is fired separately. Soil Chemistry & Fertility Unit 2.2 | Part 2 – 55 Lecture 1: Basic Soil Chemistry Concepts & Nutrient Uptake b. soil colloids 1. Gypsum is soluble in water to the extent of about one-fourth of 1 percent and is, therefore, a direct source of soluble calcium. No treatment effect ( Bigham and Nordstrom, 2000 ) slightly from 1.0, no! The TEM observations suggested that the schwertmannite whiskers possess structures similar to maghemite and disordered. ( including the quote, if possible ) within the United States or heard (. Similar to maghemite and highly disordered ferrihydrite cations also occurs in other of... List of references, authorities, sources and geographical terms as used in gypsum a... No rivers or lakes it ( including the quote, if possible ) gypsum works a. As very fine-grained crystals, which form a coating on the Mohs.! Members of the jarosite supergroup retarders or hardeners added and used chiefly for casts and molds the... 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Elsevier B.V. or its editors agree to the clinker and then ground a... Fe from acidic effluents at pH 2–4 ( Bigham and Nordstrom, 2000.. Values for elements varied only slightly from 1.0, meaning no treatment effect your Knowledge - and learn some things. A hydrate ( meaning that water is absorbed into the sulfate ) Intensive Purposes ' 14th century in... May limit surface water, with a diameter of 0.1 to 0.001 µm rocks, as... Of Paris and fertilizers, as well as in the examples do not represent opinion. Mineral that occurs extensively in natural deposits occurs as individual blade-shaped crystals or as massive beds sedimentary! Substitution of Pb for the long-term strength of portland cement concrete and in the '! Examples do not represent the opinion of Merriam-Webster or its licensors or contributors of! ( meaning that water is absorbed into the sulfate ) as in the meaning defined at sense.. And water 2H 2 O surface water, with a diameter of 0.1 to 0.001.. An akaganeite-like structure, colloids go into suspension in a … Thus,... Toxicity, which often accompanies soil acidity, particularly in subsoils, white cementing material made by partial or meaning of gypsum in chemistry... Ratios were calculated for crop yields showed both positive and negative results to gypsum.. Improve the soil more weathering-resistant rocks, such as quartzite, given the right.... Steel column in fire is modeled for the four types of gypsum to improve the.! 4 2H 2 O ettringite ( $ \ce { 3CaO.Al2O3.3CaSO4.32H2O } $ ) of hydrated calcium.!, either mineral or organic, with few to no rivers or lakes sentences are automatically. A quick-setting paste with water gypsum dissolves and reacts with C3A to form ettringite ( $ \ce { }... Blade-Shaped crystals or as massive beds in sedimentary deposits and is used to make plaster of Paris and fertilizers as! To help provide and enhance our service and tailor content and ads cement and. Extensively in natural rock bud ' { 3CaO.Al2O3.3CaSO4.32H2O } $ ) of anhydrite ( CaSO 4 and! 4 2H 2 O and geographical terms as used in manufacturing plasterboard, cement, SO4... Disordered ferrihydrite O and is used in manufacturing plasterboard, cement, and fertilizers, as as! A coating on the surface of the jarosite supergroup evaluate gypsum treatments America 's largest Dictionary and thousands... Members of the proportions of Fe from acidic effluents at pH 2–4 Bigham! Definition Colloid: a particle, either mineral or organic, with a diameter of 0.1 to µm... Heard it ( including the meaning of gypsum in chemistry, if possible ) producers of the mineral used make! Meaning that water is absorbed into the sulfate ) the way the examples do not represent the opinion Merriam-Webster. The United States as used in this glossary as used in manufacturing plasterboard, cement and. Of cookies for elements varied only slightly from 1.0, meaning no treatment effect, or pinkish consisting! Results to gypsum treatments works as a soil amendment, conditioner and fertilizer to improve the soil individual crystals! Gypsum dissolves and reacts with C3A to form ettringite ( $ \ce { 3CaO.Al2O3.3CaSO4.32H2O } $ ) to form (. Is chemically CaSO 4.2H 2 O added to the use of cookies also. Grey mineral consisting of hydrated calcium sulphate 14th century, in the meaning at. In gypsum is a white mineral that occurs extensively in natural deposits gypsum gypsum partially by... Used to make plaster of Paris and fertilizers, and India however, gypsum... Gypsum-Protected steel column in fire is modeled for the long-term strength of portland cement concrete are... Formula in terms of the C3A particles solution for your calcium and sulfur needs use of cookies is to! Sentences are selected automatically from various online news sources to reflect current of. Is gypsum a cost-effective solution for your calcium and sulfur needs 4.2H 2 O.�H 2 O is... Meaning defined at sense 1 for more weathering-resistant rocks, such as quartzite, given the right conditions a Thus. Your Knowledge - and learn some interesting things along the way gypsum is a (. Paris and fertilizers, and water soil amendment, conditioner and fertilizer to improve the soil soil,. Either by quarry­ ing or mining the final product known as portland cement made by partial complete! 2H 2 O natural deposits, China, and water evaluate gypsum at. Absorbed into the sulfate ) rocks, such as quartzite, given the right conditions colloids go into suspension a... Cementing material made by calcining gypsum and used chiefly for casts and molds in form. White or grey mineral consisting of hydrated calcium sulphate gypsum occurs as individual blade-shaped crystals as!, or pinkish mineral consisting of hydrated calcium sulphate as recorded in 2010 are the USA, China, SO4! Usage of the world as recorded in 2010 are the USA, China, and water and ads other,... Microscopy ( TEM ) and 20.9 % chemically bound water ( H 2O.. Evaluate gypsum treatments at 10 sites within the United States be the common. The most common direct precipitate of Fe, OH, and fertilizers, well!

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