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General term for several varieties of hard and soft, fine-grained rock composed of jadeite, nephrite, serpentine, or other mineralogically related materials; usually having a color ranging from dark green to green-white. Jade takes a high polish and has been used since prehistoric times for jewelry, small utensils, carvings, vases, and other ornamental objects. Some processing techniques have been used to enhance the color of inferior stones: B-jade has been bleached to remove brown stains, while C-jade has been impregnated with resins to increase its translucency; A-jade is untreated.
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