Search results
Results from the WOW.Com Content Network
Tantalite has the same mineral structure as columbite (Fe, Mn) (Ta, Nb) 2 O 6; when there is more tantalum than niobium it is called tantalite and when there is more niobium than tantalum is it called columbite (or niobite). The high density of tantalite and other tantalum containing minerals makes the use of gravitational separation the best ...
The claimed new elements pelopium, ilmenium, and dianium [19] were in fact identical to niobium or mixtures of niobium and tantalum. [20] The differences between tantalum and niobium were unequivocally demonstrated in 1864 by Christian Wilhelm Blomstrand [20] and Henri Étienne Sainte-Claire Deville, as well as Louis J. Troost, who determined ...
[15] [16] This confusion arose from the minimal observed differences between tantalum and niobium. The claimed new elements pelopium, ilmenium, and dianium [17] were in fact identical to niobium or mixtures of niobium and tantalum. [18] Pure tantalum was not produced until 1903. [19]
The similar reactivity of niobium and tantalum complicated preparation of pure samples of the metals and therefore several new elements were proposed, which were later found to be mixtures of niobium and tantalum. The differences between tantalum and niobium, and the fact that no other similar element was present, were unequivocally ...
The similar reactivity of niobium and tantalum complicated preparation of pure samples and therefore several new elements were proposed, which were later found to be mixtures of niobium and tantalum. The differences between tantalum and niobium and the fact that no other similar element was present were unequivocally demonstrated in 1864 by ...
The mineral columbite The element niobium. In 1846, Rose rediscovered the chemical element niobium, proving conclusively that it was different from tantalum. This confirmed that Charles Hatchett had discovered niobium in 1801 in columbite ore. Hatchett had named the new element "columbium", from the ore in which niobium and tantalum coexist.
Apollo CSM with the dark rocket nozzle made from niobium-titanium alloy . Niobium is nearly always found together with tantalum, and was named after Niobe, the daughter of the mythical Greek king Tantalus for whom tantalum was named. Niobium has many uses, some of which it shares with other refractory metals.
While most pegmatites have a simple composition of minerals common in ordinary igneous rock, a few pegmatites have a complex composition, with numerous unusual minerals of rare elements. These complex pegmatites are mined for lithium, beryllium, boron, fluorine, tin, tantalum, niobium, rare earth elements, uranium, and other valuable commodities.