Hafnium metal and zirconium metal are two of the elements that are most similar to each other. Therefore they are hard to separate. The silvery, heavy hafnium metal so far is used only for a few special technical applications. Hafnium carbide (HfC) and tantalum hafnium carbide (Ta4HfC5) are very hard and mechanically enduring, the latter has with more than 4000°C the highest melting point of all materials.
Amazing Hafnium metal standard density cube 10x10x10mm, 99.99% pure. The sample weighs 13 grams (with a tolerance of ± 0.1gram), which is the theoretical density of the Hafnium metal itself. This cube is amazing for any science classrooms, schools, universities and collectors. Pure Hafnium metal cube for element collection.