... form and size of gypsum crystals formed during hydration of anhydrite binders [3]. Gypsum set-retarding admixtures have strong impact on gypsum crystal habit.Nov 27, 2021 · The chemical formula for gypsum is {eq}CaSO_4·H_2O {/eq}. As an evaporite, gypsum represents a crystal formed via precipitation, in which one water molecule is used per two calcium sulfate molecules. Rock salt is an evaporite formed in restricted basins with an inflow of seawater located in an arid environmental setting. gypsum—a mineral composed of hydrous calcium sulfate (CaSO 4-2H 2 O); an evaporite mineral used in the manufacture of plaster. Gypsum is deposited by concentrated seawater and by evaporation of freshwater in arid regions.Apr 1, 2016 · Previous attempts to understand gypsum formation depended on sampling from the solutions in which the mineral was formed and drying, so it was never clear if what we were seeing was an artefact of ... Sep 1, 2022 · Implications for carbon cycling and gypsum formation. To our knowledge, this is the first time that gypsum deposits are proven to be formed from sulfate sourced almost entirely from cryptic sulfur cycling. The average rate of vertical gypsum accumulation at VdG was 1.4 mm.yr −1 (Reghizzi et al., 2018). Selenite is the crystalline form of gypsum. These crystals are very brittle and fragile. Selenite can form large crystals—some as big as bicycle tires! Visitors to the park can see selenite crystals on hikes to Lake Lucero. There are three other varieties of the mineral gypsum: satin spar, desert rose, and gypsum flower.ROCK GYPSUM. Rock gypsum is a chemical precipitate formed by the evaporation of cencentrated solutions such as seawater. It ranges in texture from massive/granular to fibrous depending on the size and shape of the gypsum crystals. Sediment type: chemical; Composition: gypsum; Grain Size: varible, commonly fibrous or granular and medium to fine ...Gypsum is a soft mineral composed of the elements calcium and sulfur, with the chemical formula CaSO4. Gypsum deposits come from the evaporation of lake and sea ...Gypsum comes from sedimentary rock and is formed by the evaporation of water that contains sulfates and calcium, such as saltwater. When the water evaporates, the minerals are left behind. Over time, they condense and form gypsum. Common Gypsum Questions. Gypsum has many uses, but one of its primary uses is in lawncare and …Apr 1, 2016 · Previous attempts to understand gypsum formation depended on sampling from the solutions in which the mineral was formed and drying, so it was never clear if what we were seeing was an artefact of ... Gypsum is a naturally occurring mineral mined from deposits formed by ancient seabeds as a raw material. Composed of calcium sulfate and water, it is used for a variety of manufacturing, industrial, and agricultural uses. Its colour is white, Grey , yellow, red, brown. An important property of gypsum is that it is naturally fire-resistant.Gypsum is an evaporite mineral most commonly found in layered sedimentary deposits in association with halite, anhydrite, sulfur, calcite, ... Minerals: Information about ore minerals, gem materials and rock-forming minerals. Volcanoes: Articles about volcanoes, volcanic hazards and eruptions past and present.PDF | Gypsum (CaSO4·2H2O) is the most common sulfate mineral on Earth and is also found on Mars. ... These “pre-nucleation” clusters may then react to form the. stable bulk crystal [75]. Thus ...1 Apr 2016 ... The formation of gypsum, from concentrated aqueous solutions of calcium sulfate, had previously thought be a single-step process. However, a ...The chemical formula for gypsum is {eq}CaSO_4·H_2O {/eq}. As an evaporite, gypsum represents a crystal formed via precipitation, in which one water molecule is used per two calcium sulfate molecules.Škocjan Caves, Slovenia Karst formation of the Serra de Tramuntana. Karst is a topography formed from the dissolution of soluble carbonate rocks such as limestone, dolomite, and gypsum.It is characterized by features like poljes above and drainage systems with sinkholes and caves underground. It has also been documented for more …Taking the form CaSO4·2H2O, gypsum is one of the most common minerals on Earth, yet its formation from ions in solution remains uncertain. Now researchers have ...The gypsum that is mined is dried and heated, and then crushed and processed to form it into a powder. This powder is then made use of in various agricultural, ...The best way to handle any tax form is to take it a step at a time. A W-9 form is an official tax document you fill out if you’re hired as a contractor, freelancer or vendor for a company. Here’s what you need to know about W-9 forms.Gypsum is considered both a sedimentary rock and a mineral. Its chemical formula is CaSO 4 ∙2H 2 O. Because gypsum formed when ancient seas evaporated in Oklahoma during Permian time (299-251 million years ago), geologists classify it as an evaporite. Western Oklahoma has many large deposits of gypsum totaling trillions of tons (Figure 1).Gypsum Alabaster. Gypsum alabaster was used in Medieval Europe in the past and in modern times, too, and it is softer than calcite alabaster. 3. ... They both formed geographically under high temperatures and pressure because these are metamorphic rocks. Alabaster is sometimes confused with soapstone (Steatite), an easily polished soft …Gypsum is often formed from evaporating water and usually contains water molecules in its crystalline structure. The ᐧ2H 2 O in the formula indicates the water molecules are whole H 2 O. This is different from minerals like amphibole, which contain a hydroxide ion (OH –) that is derived from water, but is missing a hydrogen ion (H +). Gypsum belongs to a group of minerals called the sulfates, and is the most common of the approximately 150 sulfate minerals. Sulfates are compounds of one or more metals with oxygen and sulfur. The oxygen and sulfur join together to form the sulfate ion, SO4 -2. Technically, gypsum is hydrous calcium sulfate because it has water in its crystal ...This is gypsum formed after glauberite. It is from Camp Verde, Yavapai County, Arizona. It is about 8 cm wide. These thin gypsum needles are from San Luis Potosi, Mexico. The sample is about 15 cm wide. This gypsum curl is from Santa Eulalia, Chihuahua, Mexico.The granular or powdered form of gypsum specifically marketed towards garden use has a variety of different applications. Primarily, gypsum is used for helping to break up heavily compacted clay soils making them more porous and able to absorb moisture. This is particularly helpful in areas prone to drought. The addition of gypsum …Inland seas were formed at this time in which, on evaporation, gypsum, and limestone were formed characterizing the Lower Fars Series of the Middle Miocene. He concludes that this geological formation is the origin of most gypsiferous soils in Iraq.Sep 3, 2023 · The gypsum formed irregular shaped masses within the limestone. The resulting rock is known as the Madison Limestone formation, or locally as the Pahasapa (Black Hills) Limestone. The gypsum masses were unstable. They grew and shrank as they absorbed and expelled water. This pressure fractured the gypsum and surrounding limestone. Formation Process: The formation of gypsum involves a sequence of geological and environmental processes: Deposition: Gypsum initially forms as dissolved calcium and sulfate ions in water. These ions can come from a variety of... Evaporation: In environments with high evaporation rates, such as arid ...tact between the gypsum board and framing can result in loose or damaged board and fastener imperfections. Wood Framing Wood framing meeting the following minimum requirements is neces-sary for proper performance of all gypsum drywall and plaster base assemblies: 1. Framework should meet the minimum requirements of applicable building codes. 2. Geologic Setting. Between 1.4 billion and 990 mya, volcanic activity, crustal rifting and filling of basins (formed by rifting) took place. Between 990 and 880 mya, a mountain range formed in eastern Ohio. Between 880 and 544 mya, these mountains were eroded, reducing the landscape to a gently rolling surface.Jul 4, 2023 · Gypsum crystals are common in some of the dryer parts of the cave. Gypsum, a mineral containing both calcium and sulfur, sometimes takes the form of needle-like crystals that radiate from clusters on the floor of the cave; in other cases, gypsum resembles puffs of cotton, or forms clusters of curved or coiled crystals called gypsum flowers. Gypsum, scientifically known as Calcium Sulfate Dihydrate (CaSO 4 ·2H 2 O), is a naturally occurring mineral primarily formed from the evaporation of ancient bodies of sea water …This occurs in areas such as Cleveland Avenue and Kentucky Avenue. Flowers, like crusts, form as the gypsum extrudes from the rock (like toothpaste from a tube). In a crust all the crystal grow at about the same speed, but to form a flower, some of the crystals grow faster than others.How is gypsum formed? What is chemical name of gypsum? The Chemical name of Gypsum is calcium sulphate dyhydrite whose formula is CaSO4. 2H2O. Gypsum is a soft sulfate mineral. It is widely mined and is used as a fertilizer, and as the main constituent in many forms of plaster, blackboard chalk and wallboard. ...Gypsum Plaster. Gypsum plaster mainly comprises white powder of calcium sulphate hemihydrate. This plaster is mostly produced by heating gypsum at 120–180 °C (248–356 °F). If the temperature goes beyond 392 degrees Fahrenheit, anhydrite is formed. The natural form of gypsum plaster is the mineral bassanite.Jan 29, 2021 · Gypsum is considered an evaporate and forms when evaporation of water allows oxygen to bond with the surrounding sulfur to create sulfate. The sulfate will then bond with surrounding calcium and water to create the final product gypsum. Gypsum has the following properties: Mohs Scale Hardness : 1.5 – 2. Specific Gravity: 2.31 – 2.33. When plaster of Paris absorbs water, it transforms into gypsum and so hardens, which accounts for the setting feature of plaster of Paris. The reaction of plaster of couples with water is depicted as follows: (CaSO 4). 1 2 H 2 O + 1. 1 2 H 2 O → (CaSO 4). 2 H 2 O Plaster of paris GypsumTrace amounts of Cd 2+ and Zn 2+ were found to be fixed in the byproduct-gypsum formed via the dissolution of calcium arsenate sludge with H 2 SO 4 (Fujita et al., 2009). Tinge (2004) found the Cd 2+ content in a byproduct-gypsum reached up to 6.2 mg/g and was produced via the removal of aqueous Ca 2+ by using ammonium sulfate-rich solution.Saharan gypsum desert rose from Tunisia (length 47 cm) Baryte rose from Cleveland County, Oklahoma (size:10.2 x 7.1 x 5.5 cm) Large desert rose formation in the Tunisian desert A desert rose is an intricate rose-like formation of crystal clusters of gypsum or baryte, which include abundant sand grains. [unreliable source?] The "petals" are …Tendency to chemical cement. Ash: unconsolidated fragments under. 4 mm. Tuff: consolidated ash. Volcanic Breccia: angular fragments over 4 mm. Agglomerate: large proportion (>25%) of bombs. These rocks are classified on the proportions of vitric, crystal (mineral), or lithic material they contain, for example, "vitric lithic ash," or "crystal ... Gypsum (CaSO4.2H2O) and anhydrite (CaSO4) are two related minerals that formed in Indiana during periodic episodes of ancient sea water evaporation in ...Geologists have studied the formation since the late 1800s, and today still wonder how it formed. Although much of the Tower’s geologic story is agreed upon, theories differ on certain details. ... Above the Spearfish Formation is the Gypsum Springs Formation. As mineral rich water evaporated deposits of gypsum were left behind.Geologic Setting. Between 1.4 billion and 990 mya, volcanic activity, crustal rifting and filling of basins (formed by rifting) took place. Between 990 and 880 mya, a mountain range formed in eastern Ohio. Between 880 and 544 mya, these mountains were eroded, reducing the landscape to a gently rolling surface.In archaeology, the term alabaster is a category of objects and artefacts made from the varieties of two different minerals: (i) the fine-grained, massive type of gypsum, [1] and (ii) the fine-grained, banded type of calcite. [2] In geology, gypsum is a type of alabaster that chemically is a hydrous sulfate of calcium, whereas calcite is a ...Michigan ranks first in the United States in the production of calcium chloride (salt) and in gypsum, fourth in cement and sand and gravel, and is a large producer of crushed stone for a variety of purposes. These minerals are found in the sedimentary rocks of the Michigan Basin or in the extensive glacial deposits. Gypsum is often formed from evaporating water and usually contains water molecules in its crystalline structure. The ᐧ2H 2 O in the formula indicates the water molecules are whole H 2 O. This is different from minerals like amphibole, which contain a hydroxide ion (OH – ) that is derived from water, but is missing a hydrogen ion (H + ).Gypsum contains sulfur as sulfate, the form taken up by plant roots. ... Naturally occurring gypsum was probably formed by the reaction of sulfates on limestone ...Cloud computing essentially refers to computing networked via the internet. There are, however, a number of different types of clouds, each with different mechanisms and benefits. We’ll take a quick look at these below, and also discuss how...Gypsum is often formed from evaporating water and usually contains water molecules in its crystalline structure. The ᐧ2H 2 O in the formula indicates the water molecules are whole H 2 O. This is different from minerals like amphibole, which contain a hydroxide ion (OH – ) that is derived from water, but is missing a hydrogen ion (H + ).Gypsum Plaster. Gypsum plaster mainly comprises white powder of calcium sulphate hemihydrate. This plaster is mostly produced by heating gypsum at 120–180 °C (248–356 °F). If the temperature goes beyond 392 degrees Fahrenheit, anhydrite is formed. The natural form of gypsum plaster is the mineral bassanite.Taking the form CaSO4·2H2O, gypsum is one of the most common minerals on Earth, yet its formation from ions in solution remains uncertain. Now researchers have ...The hydrated sulfate gypsum crystallized at an extremely slow rate over the course of at least 500,000 years, forming the enormous crystals found today. Discovery Location of the Swords and Crystal caves with the gypsum crystals within the idealized block diagram of Naica mine Water-clear selenite crystal "floater" from the Naica Mine. Size: 18 ...Gypsum deposits were formed millions of years ago when salt water oceans covered most of the earth, and as they receded, may inland “dead” seas were formed ...Gypsum is considered both a sedimentary rock and a mineral. Its chemical formula is CaSO 4 ∙2H 2 O. Because gypsum formed when ancient seas evaporated in Oklahoma during Permian time (299-251 million years ago), geologists classify it as an evaporite.Western Oklahoma has many large deposits of gypsum totaling trillions of tons (Figure 1).Gypsum is a soft, light-colored sedimentary rock deposited in ancient seas that covered Ohio during the Silurian Period. It occurs in both mineral form (selenite) and as a rock in bedded layers. Gypsum occurs interbedded with salt (halite, NaCl) and anhydrite (CaSO 4 ). Gypsum is used in drywall, Portland cement, plaster, bakery products, and ...The chemical formula for gypsum is {eq}CaSO_4·H_2O {/eq}. As an evaporite, gypsum represents a crystal formed via precipitation, in which one water molecule is used per two calcium sulfate molecules.Click here👆to get an answer to your question ️ (a) What is plaster of Paris? Write the chemical formula of plaster of Paris.(b) How is plaster of Paris prepared? Write chemical equation of the reaction involved.(c) Explain why plaster of Paris should be stored in a moisture - proof container.(d) State two important uses of plaster of Paris.It is made from deposits of gypsum rock or sand. Raw gypsum is heated to drive off a portion of the chemically combined water. The resulting gypsum plaster ...In 1984, USG Corporation was formed as a holding company — a reverse merger in which United States Gypsum Company became one of just nine operating subsidiaries. Through research and development and acquisition, USG continued to expand into and lead new markets. Durock® Brand Cement Board offered new water construction solutions.28 Mar 2013 ... Coal formation • Continental drift • Earthquake • Earth's magnetic field • Fossilization • Geomagnetic field decay • Oil formation • Plate ...Apr 12, 2022 · Gypsum is one of the main minerals in sedimentary rocks, and it can be found in a range of mineral varieties. Gypsum can be formed directly by precipitation due to seawater evaporation, enhanced by arid climates in hydrologically restricted marine and marginal marine settings. In the case of non-marine deposits, gypsum can be formed by the ... The dehydration products of gypsum under different temperature and water vapor pressure were investigated by thermodynamic theory. Additionally, the rehydration mechanism of soluble anhydrite was also studied by Monte Carlo (MC) simulations. The thermodynamic calculation results reveal that the dehydration mechanism of gypsum significantly depended on ambient temperature and water vapor ...May 4, 2020 · Mechanisms of gypsum−anhydrite phase transformation. The process is described in four stages. Stage I: microorganisms attach on the gypsum crystals and form a biofilm. (A and B) SEM and TEM images highlight the gypsum crystals. Confirmation of single crystalline gypsum provided through TEM and SAED (Inset) is shown in B. Jul 4, 2023 · Gypsum crystals are common in some of the dryer parts of the cave. Gypsum, a mineral containing both calcium and sulfur, sometimes takes the form of needle-like crystals that radiate from clusters on the floor of the cave; in other cases, gypsum resembles puffs of cotton, or forms clusters of curved or coiled crystals called gypsum flowers. Gypsum. Gypsum is a mineral found in crystal as well as masses called gypsum rock. It is a very soft mineral and it can form very pretty, and sometimes extremely large colored crystals. Massive gypsum rock forms within layers of sedimentary rock, typically found in thick beds or layers.Gypsum crystal nucleation was favored over growth, meaning a greater number of smaller crystals formed. The Cave of Swords, at a shallower, 120 m deep location in the mine, illustrates this ...Gypsum roses tend to have sharper edges better defined than baryt roses. Celestine and other minerals bladed with evaporite may also form clusters of rosettes. These can either appear as a single rose-like bloom, or as bloom clusters, with most sizes ranging from pea size to 4 inches (10 cm) in diameter.Evaporite deposits (largely bedded halite, sylvite, gypsum, anhydrite, and various potash salts) form from the precipitation of solid mineral crystals from a concentrated solution of salt- or freshwater, in other words, from brine. Evaporite deposits may be either marine or nonmarine (lacustrine) in origin.Gypsum is often formed from evaporating water and usually contains water molecules in its crystalline structure. The ᐧ2H 2 O in the formula indicates the water molecules are whole H 2 O. This is different from minerals like amphibole, which contain a hydroxide ion (OH – ) that is derived from water but is missing a hydrogen ion (H + ). Common gypsum is white to grey, and translucent, but just about all colors are known. Normal coarse crystals of gypsum form blades or tabs. If translucent, we call them selenite (Figures 7.42 and 7.43). Selenite commonly twins, sometimes forming characteristic swallow tail or fishtail twins. These two types of twinning are very similar and ...Gypsum Alabaster. Gypsum alabaster was used in Medieval Europe in the past and in modern times, too, and it is softer than calcite alabaster. 3. ... They both formed geographically under high temperatures and pressure because these are metamorphic rocks. Alabaster is sometimes confused with soapstone (Steatite), an easily polished soft …Battle of Stamford bridge part 14 and 15 English troops marched over the bridge and formed a line to face Harold Hardrada’s soldiers. The Norsemen then quickly made a traditional shield wall. The battle began and hand to hand combat started and both sides lost many great fighters. The Norsemen then started to regret leaving their armour behind.Mineral gypsum formed is interspersed among other minerals. Primary deposit gypsums are characterized by a loose crystalline structure and high solubility in water. Over geologic time, gypsum from primary deposits can be dissolved by flowing water carried away in solution, forming a “secondary” deposit of a much purer gypsum.Gypsum is considered both a sedimentary rock and a mineral. Its chemical formula is CaSO 4 ∙2H 2 O. Because gypsum formed when ancient seas evaporated in Oklahoma during Permian time (299-251 million years ago), geologists classify it as an evaporite. Western Oklahoma has many large deposits of gypsum totaling trillions of tons (Figure 1).Gypsum rocks are sedimentary rocks made up of sulfate mineral and formed as the result of evaporating sea water in massive prehistoric basins. This rock is found in many parts of the world. Gypsum ...Gypsum is a fertilizer product and supplies the crop-available form of calcium (Ca 2 +) and sulfur (SO 4 2-). If these forms are deficient in soil, then crop productivity will benefit if gypsum is applied. This is a big "if" for Iowa soils. Research has not shown deficiency of Ca and normally any potential problem with low Ca levels is taken ...Sedimentary rock - Evaporites, Deposits, Minerals: Evaporites are layered crystalline sedimentary rocks that form from brines generated in areas where the amount of water lost by evaporation exceeds the total amount of water from rainfall and influx via rivers and streams. The mineralogy of evaporite rocks is complex, with almost 100 varieties possible, but less than a dozen species are ...The primary source of alabaster is gypsum, a mineral composed of calcium sulfate dihydrate (CaSO4·2H2O). Gypsum is a common mineral found in sedimentary rocks and is formed by the evaporation of saline water in shallow basins or lagoons. Alabaster can be found in various locations around the world. Some notable sources include:Gypsum. Gypsum is a mineral found in crystal as well as masses called gypsum rock. It is a very soft mineral and it can form very pretty, and sometimes extremely large colored crystals. Massive gypsum rock forms within layers of sedimentary rock, typically found in thick beds or layers.The gypsum throughout the state was deposited during the Permian, when an arm of the inland sea was cut off from the main body of the ocean. That sea evaporated, leaving behind thick layers of sodium chloride (salt) and calcium sulfate (gypsum and anhydrite). These deposits are called evaporites because they formed from the evaporation of water. If hemihydrate is heated above 200 °C, anhydrite II is formed. When water is added to either hemihydrate or anhydrite, these phases rehydrate to form gypsum in an exothermic reaction. Two phases of hemihydrate result when gypsum is dry or wet heated: α-hemihydrate and β-hemihydrate, each with distinct physical properties (Kelley et al., 1941 ...Jan 29, 2021 · Gypsum is considered an evaporate and forms when evaporation of water allows oxygen to bond with the surrounding sulfur to create sulfate. The sulfate will then bond with surrounding calcium and water to create the final product gypsum. Gypsum has the following properties: Mohs Scale Hardness : 1.5 – 2. Specific Gravity: 2.31 – 2.33. The hydrated sulfate gypsum crystallized at an extremely slow rate over the course of at least 500,000 years, forming the enormous crystals found today. Discovery Location of the Swords and Crystal caves with the gypsum crystals within the idealized block diagram of Naica mine Water-clear selenite crystal "floater" from the Naica Mine. Size: 18 ...Depending on the formation conditions calcium sulfate minerals can adopt a wide variety of crystal habits/morphologies, and textures (Fig. 2).Gypsum usually appears as well-formed (highly) transparent single and twinned crystals (i.e. selenite, Fig. 2 a), and as polycrystalline semi-opaque aggregates with randomly (alabaster) or parallel (satin spar) oriented crystals (Fig. 2 b).The granular or powdered form of gypsum specifically marketed towards garden use has a variety of different applications. Primarily, gypsum is used for helping to break up heavily compacted clay soils making them more porous and able to absorb moisture. This is particularly helpful in areas prone to drought. The addition of gypsum …Most collectors are familiar with the minerals gypsum and anhydrite. Both consist basically of calcium sulfate. The difference is that gypsum (CaSO 4 ·2H 2 O) is a hydrous mineral with two attached molecules of water. Anhydrite, as its name implies, is an anhydrous mineral with no attached water molecules (CaSO 4). Thereof,how is anhydrite …The best way to handle any tax form is to take it a step at a time. A W-9 form is an official tax document you fill out if you’re hired as a contractor, freelancer or vendor for a company. Here’s what you need to know about W-9 forms.It is made from deposits of gypsum rock or sand. Raw gypsum is heated to drive off a portion of the chemically combined water. The resulting gypsum plaster ...Direct stress causes slightly touching grains to weld together, large grains form by welding small grains together, grain size increases but number of grains decreases Lithification The process in which sediments compact under pressure, expel fluids, and gradually become a solid rock.8 Mei 2023 ... ... formed selenite crystals, some as long as six feet. In 2000, miners at ... Gypsum ore, an impure form of gypsum called gypsite or gypsum rock ...Sep 12, 2023 · The gypsum formed irregular masses within the limestone. Shortly after the limestone was deposited, thin gypsum beds in the upper part of the Pahasapa were dissolved away and the overlying limestone collapsed into the resulting voids. This marked the first stage of cave development at Jewel Cave. When gypsum is added into the cement and water is added to it, reaction with C3A particles tales place to form ettringite. This ettringite is initially formed as very fine-grained crystals, which form a coating on the surface of the C3A particles .These crystals are too small to bridge the gaps between the particles of cement.Gypsum crystals still form when minerals crystallize as water evaporates. Gypsum is also found as a by-product of scrubbing sulfur from fossil fuels. Gypsum can form anywhere where the right combination of mineral elements occurs and evaporation happens. It occurs as clumps of crystals or in thick beds. Gypsum beds were formed in shallow sea ...Gypsum. Gypsum, hydrated calcium sulphate, Ca SO4.2H2O, is a common mineral formed mainly by the evaporation of sea water. Known from antiquity, its name comes from the Arabic jips, for "plaster," then to the Greek gypsos, for chalk. Gypsum Crystal, unknown Locality. University of Waterloo Earth Sciences Museum Collection. Rock salt is an evaporite formed in restricted basins with an inflow of seawater located in an arid environmental setting. gypsum—a mineral composed of hydrous calcium sulfate (CaSO 4-2H 2 O); an evaporite mineral used in the manufacture of plaster. Gypsum is deposited by concentrated seawater and by evaporation of freshwater in arid regions.How Is Gypsum Formed?. 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