Niobium
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Niobium is a chemical element; it has symbol Nb and atomic number 41. It is a light grey, crystalline transition metal. Pure niobium has a Mohs hardness rating similar to pure titanium, and it has sim
English chemist Charles Hatchett identified the element columbium in 1801 within a mineral discovered in Connecticut, US.
Picture of a Hellenistic sculpture representing Niobe by Giorgio Sommer
A very pure sample of niobium pentachloride
Columbite
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Columbite, also called niobite, niobite-tantalite and columbate, with a general chemical formula of Nb2O6, is a black mineral group that is an ore of niobium. It has a submetallic luster, a high densi
Yttrocolumbite; a species of columbite
Ferrocolumbite; a species of columbite