Vesuvianite
Pronunciation : Ve*su"vi*an*ite
Part of Speech : n.
Definition : Defn: 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.
(Min.)
Source : Webster's Unabridged Dictionary, 1913