http://inspire.ec.europa.eu/codelist/CommodityCodeValue/hafniumINSPIRE Registry teamJRC-INSPIRE-SUPPORT@ec.europa.euhttp://inspire.ec.europa.eu/registry2015-08-18 18:11 PM CEST2015-08-18 18:11 PM CESThafniumHafnium is a chemical element with the symbol Hf and atomic number 72. A lustrous, silvery gray, tetravalent transition metal, hafnium chemically resembles zirconium and is found in zirconium minerals. - http://en.wikipedia.org/wiki/Hafnium