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Rock salt Experiment Aim This is an experiment to get the purist salt that is possible in a school lab. We have to find a method to get the salt and then do it. This is the common name for the mineral "halite". Its chemical formula is NaCl. You might know this substance as table salt. And... Actually, rock salt is not K2SO4; it is NaCl. It can have impurities of gypsum (CaSO4) and sylvite (KCl) but it is very rare to find potassium sulphate as a mineral, although occasionally polyhalite (K2Ca2Mg(SO4)4.2H2O) is found associated with rock salt deposits. It is typically formed by the evaporation of salty water (such as sea water) which contains dissolved Na+ and Cl- ions. One finds rock salt deposits ringing dry lake beds, inland marginal seas, and enclosed bays and estuaries in arid regions of the world. At various times in the geologic past, very...

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