Rose, who regarded niobium oxide as the element.
COLUMBIUM, or Niobium (symbol Cb or Nb, atomic weight 94), one of the metallic elements of the nitrogen group, first detected in 1801 by C. Hatchett in a specimen of columbite (niobite) from Massachusetts (Phil.
In 1809 he proved the elementary character of columbium (niobium) and titanium.
Rose detected two new elements in the columbites of the Bodenmais, which he named niobium and pelopium; dianium was discovered by W.
Blomstrand, and others, especially of Marignac, proved the identity of columbium, dianium and niobium, and that ilmenium was a mixture of columbium and tantalum.