Andrés Manuel Del Río (10 November 1764—23 March 1849) was a Mexican chemist who discovered vanadium (as vanadinite) in 1801. November 10 is the 314th day of the year (315th in leap years) in the Gregorian Calendar, with 51 days remaining. ... 1764 was a leap year starting on Sunday (see link for calendar). ... March 23 is the 82nd day of the year in the Gregorian Calendar (83rd in Leap years). ... 1849 was a common year starting on Monday (see link for calendar). ... Chemistry (in Greek: χημεία) is the science of matter and its interactions with energy and itself (see physics, biology). ... General Name, Symbol, Number vanadium, V, 23 Chemical series transition metals Group, Period, Block 5 , 4 , d Density, Hardness 6110 kg/m3, 7. ... Vanadinite is a mineral with the formula (PbCl)Pb4(VO4)3, composed of lead chloride and lead vanadate in a proportion of 90. ... 1801 was a common year starting on Thursday (see link for calendar). ...