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Component Content (%) Na2O : 2.25 MgO : 0.27 Al2O3 : 17.80 SiO2 : 68.90 K2O : 4.90 CaO : 0.63 TiO2 : 0.13 Fe2O3 : 0.71 L.O.I. : 3.80 Physical : 100-400 microns, off-white cream colored.