... 4.71, 1.93-2.01 refractive index, birefringence, absorb light directly; magnetic susceptibility low, non-conductive; the melting point ... the manufacturing of refractory (Zirconium refractories, such as zirconium corundum brick, zirconium refractory fiber), molding industry, ceramic and enamelware producing, ... , potassium, zirconium sulfate, etc.). 2012 HOT SELL zirconium sand with good quality