nvesuvianitea green or yellow or brown mineral consisting of a hydrated silicate; it occurs as crystals in limestone and is used a gemstone
Webster's Revised Unabridged Dictionary
nVesuvianite(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.
Century Dictionary and Cyclopedia
nvesuvianiteA mineral occurring in tetragonal crystals of a brown to green color, rarely yellow or blue. It is a silicate of aluminium, calcium, and iron, and was first found on Mount Vesuvius (whence the name). Also called idocrase and egeran. Xanthite, cyprine, and wiluite are varieties.
Chambers's Twentieth Century Dictionary
nVesuvianitea mineral allied to garnet, sometimes called pyramidal garnet, found in volcanic and primitive rocks, and so called because frequent in masses ejected from Vesuvius—also Idocrase
A variety of vesuvianite (idocrase) from California, described by Dr. G. F. Kunz as californite, was at first mistaken for jade.
"Encyclopaedia Britannica, 11th Edition, Volume 15, Slice 2" by Various