Vanadium

A rare element of the nitrogen-phosphorus group, found combined, in vanadates, in certain minerals, and reduced as an infusible, grayish-white metallic powder. It is intermediate between the metals and the non-metals, having both basic and acid properties. Symbol V (or Vd, rarely). Atomic weight 51.2.

a soft silvery white toxic metallic element used in steel alloys; it occurs in several complex minerals including carnotite and vanadinite