Mexico City Mining School. Manuel Del Rio, a Spanish-born mineralogist, identified vanadium in a previously unknown mineral he called panchromium. A couple of years later, the Frenchman Alexander von Humboldt declared it to be nothing more than simple chromium. Manuel Del Rio bowed to the judgement, but he was right. Vanadium was not rediscovered until 1831 by the Swede Nils Sefström.
