... column construction, normally because of the different Country of Origin with the different types and quantity of impurities, resulting in dyed ... , non-conductive; the melting point of 2550 °C. Zircon sand normally symbiotic with ilmenite, rutile, monazite and xenotime ... enamelware producing, in addition, also used in the production of glass, metal (spongeZr) and zirconium compounds (zirconium dioxide ...