Source : Webster's Revised Unabridged Dictionary (1913)

Vanadinite \Va*nad"i*nite\, n. (Min.)
   A mineral occurring in yellowish, and ruby-red hexagonal
   crystals. It consist of lead vanadate with a small proportion
   of lead chloride.

Source : WordNet®

vanadinite
     n : a mineral consisting of chloride and vanadate of lead; a
         source of vanadium