meaning of gypsum in chemistry

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

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