... magnetic susceptibility low, non-conductive; the melting point of 2550 °C. Zircon sand normally symbiotic with ilmenite, rutile, monazite ... theoretical compositions are ZrO2 and SiO2, and a small amount of Fe2O3, CaO, Al2O3, and other impurities, theoretically pure ... enamelware producing, in addition, also used in the production of glass, metal (spongeZr) and zirconium compounds (zirconium dioxide, ...