Nb=NIOBIUM
Fresh, pure niobium is a bright platinum-white metal, but after exposure in air it develops a blue cast. The element is not found free in nature. It's usually associated with the metal tantalum.
Fresh, pure niobium is a bright platinum-white metal, but after exposure in air it develops a blue cast. The element is not found free in nature. It's usually associated with the metal tantalum.