Salt is a mineral composed primarily of sodium chloride(NaCl), a chemical compound belonging to the larger class of salts; salt in itsnatural form as a crystalline mineral is known as rock salt or halite. Salt ispresent in vast quantities in seawater, where it is the main mineralconstituent. Salt (NaCl), sodium chloride, mineral substance of greatimportance to human and animal health, as well as to industry. It is aninorganic chloride and an inorganic sodium salt. It is used in many industrialprocesses including the manufacture of polyvinyl chloride, plastics, paper pulpand many other products. In the chemical industry, salt is required in the manufactureof sodium bicarbonate (baking soda), sodium hydroxide (caustic soda),hydrochloric acid, chlorine, and many other chemicals. Salt is also employed insoap, glaze, and porcelain enamel manufacture and enters into metallurgicalprocesses as a flux (a substance promoting fusing of metals).