EAST INDIA CHEMICAL  Magnesium Sulphate manufacturers, Magnesium Sulphate suppliers,is an inorganic salt with the formula MgSO4(H2O)x where. It is often encountered as the heptahydrate sulfate mineral epsomite (MgSO4·7H2O), commonly called Epsom salt. The overall global annual usage in the mid-1970s of the monohydrate was 2.3 million tons, of which the majority was used in agriculture.