text: Several details contribute to the fact that there are only a few technical uses for hafnium : First , the close similarity between hafnium and zirconium makes it possible to use zirconium for most of the applications ; second , hafnium was first available as pure metal after the use in the nuclear industry for hafnium-free zirconium in the late 1950s .
simplified: Hafnium is found in zirconium minerals .