Zircon (ZrSiO4) is found usually as a constituent in heavy mineral sand assemblages which include ilmenite, rutile, leucoxene, monazite and garnet in varying proportions. Investigations are carried out on the zircons recovered as a non magnetic and non conducting heavy mineral from the entire process for effective utilization. Recovered zircons are used for making zircon bricks and are fired at different temperatures in an industrial tunnel kiln. Physical, chemical and thermo-mechanical properties are evaluated. Mineralogical properties are correlated with the thermo-mechanical properties. The developed bricks are compared with the standards for their suitability in industrial applications.