Chemically gypsum is:

# Chemically gypsum is:
A. Calcium sulphate dihydrate
B. Calcium aluminofluorosilicate
C. Calcium carbonate
D. Magnesium carbonate

The correct answer is A. Calcium sulphate dihydrate.

Gypsum (CaSO4•2H2O; calcium sulfate dihydrate) is a mineral mined in various parts of the world, but it is also produced as a by-product of flue gas desulfurization in some coal-fired electric power plants. Various crystalline forms of gypsum, such as selenite and alabaster, exist in nature. Gypsum products are supplied as fine hemihydrate powders that are produced by heating ground gypsum particles. After mixing with water, the mixture reverts back to gypsum. This unique property of gypsum products has led to numerous applications through history.

Reference: PHILLIPS’ SCIENCE OF DENTAL MATERIALS, Anusavice, Shen, Rawls, 12th Edition
Page no: 182

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