Assertion: mineral zircon | /r/HasAspect | a hafnium content
Facets:
value: generally
type: DEGREE
Source sentences:
text: For example, the minerals zircon, ZrSiO 4 (zirconium orthosilicate), and baddeleyite, which is essentially pure zirconium dioxide, ZrO 2 , generally have a hafnium content that varies from a few tenths of 1 percent to several percent.