Gypsum is a soft sulfate mineral composed of calcium sulfate dehydrate, with the chemical formula CaSO4·2H2O.
Color: Colorless to white; may be yellow, tan, blue, pink, brown, reddish brown or gray due to impurities.
Mohs scale hardness 1.5–2
Luster Vitreous to silky, pearly, or waxy, Streak White
Specific gravity ( 2.31–2.33 ), Fusibility (5), Solubility Hot, dilute HCl
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