Sodium hexafluorosilicate (SFS) crystals were synthesized by precipitation by the reaction of hydrofluorosilicic acid and sodium carbonate at a DA of 2.5 and 3.5 and a magnetic field of 5.5 T was applied immediately after precipitation for 45 min at 20 degrees C. SEM, XRD and FTIR spectroscope examined the crystals produced with and without a magnetic field.