... green crystal for fertilier,water treatment, mining usage FeSO4.7H2O 98% [Product Name]: Ferrous Sulfate [Molecular Formula]: FeSO4.7H2O[Packing]: plastic ... analysis [Quality Index]: ItemValuePremium gradeFirst gradeSecond gradeFerrous sulfate (FeSO4.7H2O) ,%≥98.094.090.0TiO2 , %≤0.50.50.75mWater insoluble matter, %≤0 ...