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Colum′bate, a salt or compound of columbic acid with a base; Colum′bite, the native ore of columbium; Colum′bium, a metallic element now called niobium.

Columbium oxychloride, CbOCl3, is formed when carbon tetrachloride, and columbic acid are heated together at 440� C.: 3CCl4 + Cb2O5 = 2CbOCl3 + 3COCl2, and also by distilling the pentachloride, in a current of carbon dioxide, over ignited columbic acid.

Niobic acid is in its properties similar to columbic acid.

When heated in the air it is oxidized into columbic acid, and is only soluble in hydrofluoric acid, yielding hydrogen.

It melts with microcosmic salt quite readily in both of the flames, to a clear bead, which appears, if a considerable quantity of columbic acid be present, of a yellow color while hot, but colorless when cold, and does not become clouded if the intermittent flame be applied to it.