High purity Magnesium sulphate powder high quality and competitive price iso 9000 and 14000 best service good delivery High purity Magnesium sulphate powder MgSO4molecular formula: MgSO4. 7H2O CAS: 10034-99-8 Appearance: Colorless particleProperties:Colorless columnar or granular particles. A bitter salty. The relative density 1.67. In dry air weathering. Melting point 1124 °C (no water content), ...