Understanding gypsum in 3 diagrams
Learn how gypsum, hemihydrate and anhydrite react with water and change their crystal structure and solubility. See thermal analysis, dilatometry and …
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Learn how gypsum, hemihydrate and anhydrite react with water and change their crystal structure and solubility. See thermal analysis, dilatometry and …
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Of the precipitates, calcium sulfate – crystallizing mainly in the form of gypsum, calcium sulfate dihydrate (CaSO 4 ·2H 2 O) – is one of the most common representatives, which is present (or may form) in a large variety of natural and industrial processes, such as acidic wastewater treatment, phosphonic acid production, wet flue …
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Chemically known as "calcium sulfate dihydrate," gypsum contains calcium, sulfur bound to oxygen, and water. Gypsum is an abundant mineral and takes forms including alabaster—a material used in decoration and construction as far back as ancient Egypt. The White Sands National Monument in New Mexico is the world's largest gypsum dunefield.
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Both gypsum (Calcium Sulfate Dihydrate) and anhydrite (Calcium Sulfate) have the same solubility of 0.205 grams per 100 grams water (2019 CRC Handbook of Chemistry and Physics). This has also been verified by many field trials by soil scientists, agronomists, and western farmers. The solubility of 0.205 grams per 100 grams water equates to: 0. ...
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Calcium sulfate occurs in nature in form of three different minerals distinguished by the degree of hydration: gypsum (CaSO4·2H2O), hemihydrate (CaSO4·0.5H2O) and anhydrite (CaSO4).
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The Naica Mine is located in the small town of Naica in the state of Chihuahua. Naica is known for its extraordinary caves – Cave of Crystals and Cave of Swords – both of which are famous for their large gypsum crystals. Perhaps there are other similar caves somewhere on the Earth, but to this day the Cave of Crystals is unique of …
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Learn about the Crystal Cave of Naica, a natural wonder in Mexico with massive gypsum crystals, some reaching 11 meters in length. Discover how these …
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Gypsum was known in Old English as spærstān, "spear stone", referring to its crystalline projections.(Thus, the word spar in mineralogy is by way of comparison to gypsum, referring to any non-ore mineral or crystal that forms in spearlike projections). In the mid-18th century, the German clergyman and agriculturalist Johann Friderich Mayer …
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According to the data obtained for β-hemihydrate binder with SP and lime has low deformations started with low shrinkage in the initial time up to 0.04 mm/m with subsequent expansion up to 0.17 ...
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The chemical formula for gypsum is CaSO 4.2H 2 O (calcium sulfate dihydrate). Gypsum forms typical monoclinic crystals. Gypsum forms typical monoclinic crystals. Most often, it forms in perfect tabular crystals, but it can also appear as acicular (long and thin) crystals in large bundles, rosettes, grainy or scaly crystals, fibrous veins, …
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Gypsum, scientifically known as Calcium Sulfate Dihydrate ... Mexico. Uses of Gypsum. Construction: Gypsum is primarily used in construction as the main ingredient in drywall, also known as plasterboard or wallboard. Its fire resistance, sound isolation properties, and versatility make it a staple in modern construction. ...
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The water in dihydrate gypsum does not alter that, although it does dilute the potency of dihydrate gypsum by more than 20%. One difference between them is that, when immersed in water, the soft dihydrate gypsum dissolves faster than harder anhydrite gypsum. Biochemist Garn Wallace explains it this way: "Anhydrite gypsum is a …
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Formation of natural gypsum megacrystals in Naica, Mexico Juan Manuel García-Ruiz* Instituto Andaluz de Ciencias de la Tierra, Consejo Superior de Investigaciones CientíficasUniversidad de Granada, Campus Fuentenueva, E-18002 Granada, Spain Roberto Villasuso Compañía Peñoles, Unidad Naica, Naica, Chihuahua, Mexico Carlos …
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Calcium sulfate exists in three forms, namely dihydrate or gypsum (CaSO4·2H2O), anhydrite (CaSO4), and hemihydrate or bassanite (CaSO4·0.5H2O) depending on temperature, pressure, pH, and formation conditions. The formation of calcium sulfates occurs widely in nature and in many engineering settings. Herein, a …
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The mine caves of Naica (Chihuahua, Mexico) became world renowned a century ago, when gypsum crystals up to 2 m in length were revealed in the Cueva de las Espadas (Degoutin 1912; Foshag …
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In the Table 2, the gypsum dihydrate contents of the recycled gypsum dihydrate made in Oita Prefecture (100−C GH) were 93.2 % (proposed equations) and 93.3 % (empirical equations) with natural water content and when dried at 45 °C. These values ideally should be 100 %, because the gypsum crushed, fractured and separated from …
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The latest information on gypsum has been covered in detail at past Midwest Soil Improvement Symposiums. The event — which has been held in conjunction with The Ohio State University's …
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The search for effective technological operations to stabilize technical characteristics used in producing gypsum binders has received a great deal of attention in recent years owing to the instability of calcined gypsum properties [1]. Gypsum hemihydrate is a material used in the building industry and produced by means of calcinating gypsum.
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Learn how Mexico's Cueva de los Cristales, home to some of the world's largest natural crystals, was formed by volcanic activity and mineral-rich water. Discover the secrets of these stunning...
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Learn about gypsum, a calcium sulfate dihydrate that forms from evaporated sea water and lakes. Discover its uses in construction, agriculture, industry, and its environmental and …
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dihydrate: Jour. Inorg. Nucl. Chem., v. 33, p. 2295-2311. ... Gypsum and anhydrite are both soluble minerals forming rocks that can dissolve at surface and underground resulting in sulphate karst ...
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Industry revenue of "Gypsum and gypsum products manufacturing" in Mexico 2012-2024 Gypsum production United Kingdom (UK) 2009-2014 Export volume of gypsum from Tanzania 2015-2019
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Gypsum, a soft sulfate mineral known as calcium sulfate dihydrate, has been used for centuries as a reliable soil amendment to improve soil structure, enhance water infiltration, and reclaim saline and sodic soils.Its ability …
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OMRI Listed - Cz Gypsum Calcium Sulfate Dihydrate is an All-Natural mineral fertilizer listed by the Organic Materials Review Institute (OMRI). It may be used in certified organic production or food processing and handling according to the USDA National Organic Program regulations.
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Leela Hutchinson was one of the first explorers to enter the Giant Crystal Cave of selenite (gypsum) in Naica, Mexico in January 2001. These colossal pylons of selenite crystals are located nearly 1,000 feet down inside a 200-year-old working silver mine in the village of Naica, Chihuahua in the Tarahumara Sierra Madre Mountains.
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What is Gypsum Used For? ... lesser known than quartz, talc, and iron ore, gypsum is a powerhouse in the mineral world. Composed of calcium sulfate dihydrate, gypsum can easily be found in deposits across the globe. ... as hot springs and volcanic vapors. Occasionally, gypsum will occur naturally as sand. White Sands National Park …
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The effects of silica colloids on calcium sulfate dihydrate (gypsum, CaSO4·2H2O) crystallization are studied using feed solutions of varying degrees of supersaturation. A combination of light transmittance and electrical conductivity measurements is employed to characterize various aspects of the crystallization …
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Gypsum Calcium Sulfate Dihydrate Application Rates For Vegetable Gardens & Flower Beds: To prepare new gardens, apply 1-1.5 lbs per 100 square feet by evenly distributing over soil surface by hand or spreader. Incorporate into the top 2-4 inches before seeding/sodding.
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to make gypsum wallboard water resistant (WR) are by incorporating hydrocarbon wax or polymethylhydrogensiloxane (PMHS or siloxane) into the gypsum slurry during board manufacture. In this paper, the chemistries and applications of wax, siloxane, gypsum and their interactions in the gypsum wallboard manufacturing process are discussed.
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Wang et al. [39] theoretically investigated the gypsum solubility in the aqueous solutions of MgSO 4 /H 2 SO 4 from 298.1 K to 363.1 K on the basis of the Pitzer model's predictions. It was found that the gypsum solubility values decreased uniformly as the concentration of MgSO 4 increased if the H 2 SO 4 concentration was >0.5 mol/kg. …
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