High Quality Content by WIKIPEDIA articles! It was originally discovered in Mexico by the Spanish mineralogist Andres Manuel del Rio in 1801. He called the mineral "brown lead" and asserted that it contained a new element, which he first named pancromium and later, erythronium. However, he was later led to believe that this was not a new element but merely an impure form of chromium. In 1830, Nils Gabriel Sefstrom discovered a new element, which he named vanadium. It was later revealed that this was identical to the metal discovered earlier by Andres Manuel del Rio. Del Rio's "brown lead" was also rediscovered, in 1838 in Zimapan, Hidalgo, Mexico, and was named vanadinite due its high vanadium content. Other names that have since been given to vanadinite are johnstonite and lead vanadate.

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