Vesuvianite

[vi'su:viәnait]

Definition

(noun.) a green or yellow or brown mineral consisting of a hydrated silicate; it occurs as crystals in limestone and is used a gemstone.

Typed by Billie--From WordNet

Definition

(n.) 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.

Inputed by Andre