Vanadinite is an uncommon mineral, only occurring as the result of chemical alterations to a pre-existing lead minerals in arid climates. It was originally discovered in Mexico by the Spanish mineralogist Andrés Manuel del Río in 1801. He called the mineral "brown lead" and asserted that it contained a new element, which he named erythronium. In 1830, Nils Gabriel Sefström discovered a new element, which he named vanadium. It was later revealed that this was identical to the metal discovered earlier by Andrés Manuel del Río. Del Río's erythronium. Was also rediscovered, in 1838 in Zimapan (Mexico) and was named vanadinite because of its high vanadium content. The best specimen com from Mibladen (Morocco).