(n) a green or yellow or brown mineral consisting of a hydrated silicate; it occurs as crystals in limestone and is used a gemstone, Syn.vesuvian, idocrase
The Collaborative International Dictionary of English (GCIDE) v.0.53
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 ]
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 ]
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