In 1794, Louis Nicolas Vauquelin received samples of crocoite ore. He produced chromium trioxide (CrO3) by mixing crocoite with hydrochloric acid. In 1797, Vauquelin discovered that he could isolate metallic chromium by heating the oxide in a charcoal oven, for which he is credited as the one who truly discovered the element. Vauquelin was also able to detect traces of chromium in precious gemstones, such as ruby and emerald.
IN 1794, LoUis niCOlaS vauqueLin received SamPlEs Of crocOitE ore. He prODuCed chRomium tRioxide (cRo3) bY MIxIng croCoite with hYdrochlOric Acid. iN 1797 VaUqueliN discoveRed thaT he cOuLD iSoLATE MetallIC chrOmiUm by HeaTinG thE OxiDE iN A chArcoAl oven, for which He is credITEd as the oNe wHO trulY dIsCovered The eLement. VaUqUELIn wAs also able tO dEteCT trAceS of chroMiUm in PReciouS gemstoneS, such as ruby and eMeralD.