Assertion: hafnium | /r/AtLocation | nature
Facets:
value: in small amounts
type: OTHER
value: normally
type: DEGREE
value: together
type: MANNER
Source sentences:
text: Hafnium and zirconium tend to occur together in nature and the similarity of their ionic radii makes their chemical separation rather difficult.
text: Normally hafnium occurs in nature in small amounts associated with zirconium in most zirconium minerals.