Assertion: hafnium | /r/AtLocation | zirconium minerals
Facets:
value: together
type: MANNER
value: in 1923
type: TEMPORAL
value: often
type: TEMPORAL
value: as a tetravalent transition metal
type: MANNER
Source sentences:
text: Hafnium is found in zirconium minerals.
text: Hafnium is a lustrous, silvery gray, tetravalent transition metal, hafnium chemically resembles zirconium and is found in many zirconium minerals.
text: Hafnium is not found free in nature but is found in most zirconium minerals at a concentration of between one and five percent.
text: Hafnium is rarely found free in nature, and instead is present in most zirconium minerals at a concentration of up to 5 percent.
text: It is found in numerous zirconium minerals as a tetravalent transition metal.
text: Hafnium was thought to be present in various zirconium minerals many years prior to its discovery, in 1923, which was credited to Dirk Coster and George Charles von Hevesey.
text: In fact, it is often found together in zirconium minerals.
text: It chemically resembles zirconium and is found in zirconium minerals,
text: Hafnium is found in zirconium minerals.
text: Hafnium is a lustrous, silvery gray, tetravalent transition metal, hafnium chemically resembles zirconium and is found in many zirconium minerals.