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How Is Gypsum Formed? | Hunker

These gypsum deposits became sedimentary rock beds when they were cemented together. Dissolved particles and decayed matter carried by water were left between gypsum grains, making the natural cement that holds sediment together. Other sand and soil was deposited on top of the gypsum layer and pressed down on it creating the gypsum bed.

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Factsheet on: What is Gypsum?

When Gypsum ( CaSO 4,2H 2O) is ground to a powder and heated at 150° to 165° C, three-quarters of its combined water is removed producing hemi-hydrate plaster ( CaSO 4,1/2H 2O), commonly known as the 'Plaster of Paris'. When this powder is mixed with water the resulting paste sets hard as the water recombines to produce Gypsum again.

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Why Apply and with a lawn fertilizer spreader, at the rate of 40 pounds per thousand square feet. The granular grade is the best, and easiest to apply, for home and garden use, as it breaks up clay soil to make it more suitable for growing ...

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