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what is the composition of the gypsum powder

What is the composition of the gypsum powder
Gypsum is a mineral, monoclinic crystal, a fiber or tabular, also have massive, 
fine-grained, a grayish, reddish, pale yellow or pale blue. Heating gypsum to 128 DEG C, lost most of its crystal water, become mature gypsum; 163 DEG C, crystal water lose all. Plasticity plaster powder mixed with water,
but soon re harden into stone. This process release a lot of heat and expansion, so it can be used for casting model and sculpture. Calcium sulfate and gypsum can be used as a joint manufacture of sulfuric acid and
cement raw materials, can also be used as paint, paper fillers and bean curd coagulant.