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Gypsum has many uses, when heated until most of its water of crystallisation is driven off it becomes plaster of Paris. (A hemihydrate). This can then, by the addition of water, be turned back into a solid. Some of the many uses are; moulds for ceramics, architectural mouldings, pattern making, dental prosthesis manufacturing, blackboard chalks, plasterboards, sculpture and craft work, to name just a few. Gypsum in its raw form (a di-hydrate) is used as a soil treatment in agriculture where it breaks down clays. Also it can be added to ponds to correct acidity and improve the pond soil.

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12y ago

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