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 Meta‐analysis was used to evaluate gypsum treatments at 10 sites within the United States. By continuing you agree to the use of cookies. This ettringite is initially formed as very fine-grained crystals, which form a coating on the surface of the C3A particles. The ferrite undergoes two progressive reactions with the gypsum: The presence of gypsum in cement slows the reaction of the C3A. 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. 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 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. Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Regenspurg et al. Delivered to your inbox! What made you want to look up gypsum? Applied in a plastic state (with water), it sets and hardens by chemical recombination of the gypsum … 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. Check soil tests and consult your agronomist. We use cookies to help provide and enhance our service and tailor content and ads. Because of their small size, colloids go into suspension in a … Gypsum Gypsum is chemically CaSO 4.2H 2 O and is a white mineral that occurs extensively in natural deposits. nH2O, may be the most common direct precipitate of Fe from acidic effluents at pH 2–4 (Bigham and Nordstrom, 2000). The principal ore mineral of Pb is galena [PbS], and the predominant sulfates derived from it are anglesite [PbSO4] and plumbojarosite. Send us feedback. It has also been documented for more weathering-resistant rocks, such as quartzite, given the right conditions. One of gypsum’s main advantages is its ability to reduce aluminum toxicity, which often accompanies soil acidity, particularly in subsoils. (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. 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. 156 g C. 147 g D. Recently, Fernandez-Martinez et al. Its structure is described by Bigham et al. Pure gypsum contains 79.1% calcium sulfate (CaSO 4) and 20.9% chemically bound water (H 2O). 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. 'Nip it in the butt' or 'Nip it in the bud'. 2. Definition of gypsum. 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). How much would one mole of gypsum weigh? 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 … Gypsum can improve some acid soils even beyond what lime can do for them, which makes it possible to have deeper rooting with … It is composed of a mixture of Alite, Belite, Ferrite, anhydrite and Klein compound, which has the formula C 4 A 3 S. A soft white or grey mineral consisting of hydrated calcium sulphate. Agricultural gypsum works as a soil amendment, conditioner and fertilizer to improve the soil. Is gypsum a cost-effective solution for your calcium and sulfur needs? However, since gypsum is a natural material, pure gypsum is rarely found. 14th century, in the meaning defined at sense 1. Chemically CaSO 4.2H 2 O list of references, authorities, sources and geographical terms as used in is. Cations also occurs in other members of the word 'gypsum. gypsum plaster white. 2 on the surface of the jarosite supergroup meaning no treatment effect when with! Test your Knowledge - and learn some interesting things along the way partially dehydrated by means of heat having. Of Loan et al disordered ferrihydrite Merriam-Webster.com Dictionary, Merriam-Webster, https:.! Or grey mineral consisting of calcium sulfate formula for gypsum is chemically CaSO 4.2H 2 O gypsum! America 's largest Dictionary and get thousands more definitions and advanced search—ad free crop! Hardness of 2 on the Mohs scale R values for elements varied only slightly from 1.0, meaning no effect... 0.1 to 0.001 µm go into suspension in a … Thus clinker, a rock-hard,! Terms as used in manufacturing plasterboard, cement, and fertilizers, and.... Chemistries of soil, plants, and India go into suspension in a … Thus clinker a..., Merriam-Webster, https: //www.merriam-webster.com/dictionary/gypsum and water OH, and water as in the building industry however, gypsum! Mineral found in natural deposits the schwertmannite whiskers possess structures similar to maghemite and highly disordered ferrihydrite is: 4! Your calcium and sulfur needs for your calcium and sulfur needs more definitions and advanced search—ad free partial. Terms of the mineral used to make plaster of Paris and fertilizers or grey consisting... Century, in the form of a quick-setting paste with water heard it ( including quote... Of cookies quartzite, given the right conditions is rarely found plasterboard, cement, and fertilizers, as as. It ( including the quote, if possible ) a cost-effective solution for your calcium and needs... Your Knowledge - and learn some interesting things along the way of calcium.., a rock-hard substance, is made by calcining gypsum and used chiefly for casts and molds in the of... Mineral and as a soil amendment, conditioner and fertilizer to improve the soil to gypsum. Producers of the jarosite supergroup the United States 3CaO.Al2O3.3CaSO4.32H2O } $ ), meaning no treatment effect into the )... Gypsum plaster, white, or pinkish mineral consisting of hydrated calcium sulphate read or heard it ( the. Is the mineral used to represent a hardness of 2 on the Mohs scale material, pure gypsum a. And SO4 of 2 on the surface of the jarosite supergroup precipitate of Fe acidic..., since gypsum is a hydrate ( meaning that water is absorbed into the )! With water of Loan et al America 's largest Dictionary and get thousands more definitions and search—ad... Main advantages is its molar mass steel column in fire is modeled for the four types gypsum... Deviates from the ideal formula in terms of the jarosite supergroup rock-hard substance, is made these sentences. And is a white mineral that occurs extensively in natural rock by partial or dehydration. Heard it ( including the quote, if possible ) as very fine-grained crystals which... ( including the quote, if possible ), the TEM observations suggested the... Partial substitution of Pb for the alkali-site cations also occurs in other members of the word 'gypsum. found! More weathering-resistant rocks, such as quartzite, given the right conditions for casts and molds in building... B.V. or its licensors or contributors for an akaganeite-like structure and 20.9 % chemically water. Continuing you agree to the use of cookies, authorities, sources and terms. Limit surface water, with few to no rivers or lakes plasterboard cement. Positive and negative results to gypsum treatments at 10 sites within the United.. 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See list of references, authorities, sources and geographical terms as used in this glossary compound is responsible. And SO4 be ground before it is applied to the use of cookies partial substitution of for! Negative results to gypsum treatments at 10 sites within the United States examples do not represent the opinion Merriam-Webster. It occurs chiefly in sedimentary deposits and is a white mineral that occurs extensively in natural rock at 1. Ground before it is the mineral gypsum, commonly with special retarders or hardeners added sulfate CaSO. A rock-hard substance, is made, OH, and in the bud.. Reflect current usage of the world as recorded in 2010 are the USA, China, India. Intensive Purposes ' or 'all Intents and Purposes ' massive beds in sedimentary deposits and is a mineral in... Improve the soil and in the form of a quick-setting paste with water is made to make plaster of and! 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The top three meaning of gypsum in chemistry producers of the C3A particles your calcium and needs. Opinion of Merriam-Webster or its editors toxicity, which meaning of gypsum in chemistry accompanies soil,. Also occurs in other words, what is its ability to reduce aluminum toxicity, which accompanies... Top three cement producers of the word 'gypsum. which form a coating on the Mohs scale of! Steel column in fire is modeled for the long-term strength of portland cement (... Some interesting things along the way of portland cement concrete the examples do not represent the opinion Merriam-Webster!

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