... 7.8, specific gravity 4.6-4.71, 1.93-2.01 refractive index, birefringence, absorb light directly; magnetic susceptibility low ... the production of glass, metal (spongeZr) and zirconium compounds (zirconium dioxide, zirconium oxychloride, zirconium, sodium fluorozirconate, potassium, zirconium sulfate, etc.). 2012 HOT SELL zirconium sand with good quality