Zircon 
Zircon is mainly consumed as an opacifier , and has been known to be used in the decorative ceramics industry. [14] It is also the principal precursor not only to metallic zirconium , although this application is small, but also to all compounds of zirconium including zirconium dioxide (ZrO 2 ), one of the most refractory materials known.

Zircon

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