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Aside from occasional use as gem material, it is widely used as an ornamental stone. Figure (B) shows a crystal of Amazonite from Pike's Peak, Colorido. This is a common jade substitute. The illustration o{ sunstone at (C) does not reveal the identifying characteristics, namely the red- dish or yellowish cast, a result of the reflections from metallic inclusions. A moonstone cat's eye is shorvn at (D) and a large precious moonstone at (E). Specimens from the collection of British (Natural History) Museum, London. PLATE XVI PriDted iil England .'., c \ -- i\ r^--' @l ,.; .,ffi 1\i, i, ",i ; t 7 "B c CRYSTALS:TRICLINIC SYSTEM The mineral axinite (A) takes its name from its wedse or axe shaped crystals. Gems occur in clove brown. honey yillow and rarely in blue. Principal locality is Bourg d'Oisans,France. Alhite (B) is tl.re soda feldspar. The crystals are triclinic and frequently twinnecl. Its name, due to its unusually whirc appear- ance is derived from the Latir.ralbus (white). Rhodonite (C) at its best finds wide lrse as an ornamental stone. This line crystal is frorn Franklin Furnace, New Jersey, Specimens from the collection of British (Natural History) X{useum, London. 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