| Vesuvianite | 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 ] |
| Vivianite | n. [ So called by Werner after the English mineralogist F. G. Vivian. ] (Min.) A hydrous phosphate of iron of a blue to green color, growing darker on exposure. It occurs in monoclinic crystals, also fibrous, massive, and earthy. [ 1913 Webster ] |