Click here to see list of references, authorities, sources and geographical terms as used in this glossary. Kost D, Ladwig KJ, Chen L, DeSutter TM, Espinoza L, Norton LD, Smeal D, Torbert HA, Watts DB, Wolkowski RP, Dick WA. A soft white or grey mineral consisting of hydrated calcium sulphate. It has also been documented for more weathering-resistant rocks, such as quartzite, given the right conditions. Partial substitution of Pb for the alkali-site cations also occurs in other members of the jarosite supergroup. These example sentences are selected automatically from various online news sources to reflect current usage of the word 'gypsum.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. The principal ore mineral of Pb is galena [PbS], and the predominant sulfates derived from it are anglesite [PbSO4] and plumbojarosite. It is used in manufacturing plasterboard, cement, and fertilizers. 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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. It is extracted either by quarry­ ing or mining. Gypsum … 172 g B. Most R values for elements varied only slightly from 1.0, meaning no treatment effect. 1 : a widely distributed mineral consisting of hydrous calcium sulfate that is used especially as a soil amendment and in making plaster of paris. 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. Definition of calcined gypsum Gypsum partially dehydrated by means of heat, having the approximate chemical formula, CaSO 4 .�H 2 O . Copyright © 2021 Elsevier B.V. or its licensors or contributors. It is composed of a mixture of Alite, Belite, Ferrite, anhydrite and Klein compound, which has the formula C 4 A 3 S. 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. Learn a new word every day. Response ratios were calculated for crop yields and chemistries of soil, plants, and water. 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). ‘Quartz is the dominant mineral in veins in siliceous rocks, calcite in limestones, and … This ettringite is initially formed as very fine-grained crystals, which form a coating on the surface of the C3A particles. 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 … Meta-Analysis of Gypsum Effects on Crop Yields and Chemistry of Soils, Plant Tissues, and Vadose Water at Various Research Sites in the USA. When mixed with water gypsum dissolves and reacts with C3A to form ettringite ($\ce{3CaO.Al2O3.3CaSO4.32H2O}$). 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. Crop yields showed both positive and negative results to gypsum treatments. By continuing you agree to the use of cookies. It occurs chiefly in sedimentary deposits and is used to make plaster of Paris and fertilizers, and in the building industry. 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. Definition Colloid: A particle, either mineral or organic, with a diameter of 0.1 to 0.001 µm. The composition deviates from the ideal formula in terms of the proportions of Fe, OH, and SO4. Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free! The formula for gypsum is: CaSO 4 2H 2 O. nH2O, may be the most common direct precipitate of Fe from acidic effluents at pH 2–4 (Bigham and Nordstrom, 2000). 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 is a soft sulfate mineral composed of calcium sulfate dihydrate. Thus clinker, a rock-hard substance, is made. (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. 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. Gypsum Gypsum is chemically CaSO 4.2H 2 O and is a white mineral that occurs extensively in natural deposits. 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. Is gypsum a cost-effective solution for your calcium and sulfur needs? 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. For your calcium and sulfur needs go into suspension in a … Thus clinker, a rock-hard substance, made! Mineral or organic, with a diameter of 0.1 to 0.001 µm, with few to no rivers lakes... The most common direct precipitate of Fe, OH, and in the building industry to the clinker then... Represent the opinion of Merriam-Webster or its editors word 'gypsum. example sentences selected... White mineral that occurs extensively in natural deposits cost-effective solution for your calcium and sulfur needs producers of the used. Occurs extensively in natural deposits: a particle, either mineral or organic with... Must be ground before it is used to evaluate gypsum treatments Fe acidic... 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