Magnesium hexafluorosilicate hexahydrate, min. 98 %, pure, Molar mass (M) 274,47 g/mol, Density (D) 1,79 g/cm³, CAS No. [18972-56-0], UN-Nr. 2853, EG-Nr. 241-022-2, Empirical formula MgSiF6 · 6 H2O