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Magnesium-bearing minerals discovered on the earth so far occur mainly as solid or liquid.The former include magnesite(MgCO3),dolomite(MgCO3·CaCO3),carnallite(MgC12·KCl·6H2O),bischofite(MgCl2·6H2O) and serpentine(3MgO·2SiO2·2H2O).