Assertion: zircon | /r/HasProperty | principal precursor
Facets:
value: to metallic zirconium
type: OTHER
Source sentences:
text: 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.