Difference between gypsum and phosphogypsum
Calcium sulphate is used in food, hair shampoo and others as a coagulant.
How can I be sure it is mined gypsum ( natural ) and not phosphogypsum, commonly called gypsum.
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Phosphogypsum refers to the calcium sulfate hydrate formed as a by-product of the production of fertilizer from phosphate rock. It is mainly composed of gypsum (CaSO4·2H2O). Although gypsum is a widely used material in the construction industry, phosphogypsum is usually not used, but is stored indefinitely because of its weak radioactivity. The long-range storage is controversial.
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