Source : Webster's Revised Unabridged Dictionary (1913)

Vesuvianite \Ve*su"vi*an*ite\, n. (Min.)
   A mineral occurring in tetragonal crystals, and also massive,
   of a brown to green color, rarely sulphur yellow and blue. It
   is a silicate of alumina and lime with some iron magnesia,
   and is common at Vesuvius. Also called {idocrase}.

Source : WordNet®

vesuvianite
     n : a green or yellow or brown mineral consisting of a hydrated
         silicate; it occurs as crystals in limestone and is used
         a gemstone [syn: {vesuvian}, {idocrase}]