From The Collaborative International Dictionary of English v.0.48:

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.
   [1913 Webster]
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