... column construction, normally because of the different Country of Origin with the different types and quantity of impurities, resulting in dyed ... -2.01 refractive index, birefringence, absorb light directly; magnetic susceptibility low, non-conductive; the melting point of 2550 °C. Zircon sand ... , sodium fluorozirconate, potassium, zirconium sulfate, etc.). High quality Zirconium Sand with best price