... or white granular; easily becoming efflorescent in the dry air. Magnesium Sulphate HeptahydrateMOLECULAR FORMULAR: MgSO4.7H2OSPECIFICATION:HG/T 2680-95ITEMSNATURAL GRADESYNTHETICG GRADEMgSo4 ... , porcelain, pigment, match, fireproof materials, Mg-salt, dyeing, medicine and food additives; Extensively used in food, pharmaceutical and animal remedy industries.