Hafnium (symbol Hf) is a chemical element, a transition metal with atomic number 72 on the periodic table.
Characteristics and history
Hafnium has an atomic mass of 178.49. This element was discovered by Humans for the first time on Earth's European continent in Denmark, in the year 1923. (ST reference: Star Fleet Medical Reference Manual)
Hafnium is often found with zirconium. Found on many worlds, hafnium is commonly mined by the Acolytes of the Stars on Pollux V among others planets. (TOS video game: 25th Anniversary)