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(a silicate of sodium and aluminum in the pyroxene group of minerals). Nephrite is typically green, although it may be yellow, white or black. Jadeite varies from white or near-colorless, through various shades of green (including an emerald green, termed 'imperial'), to lavender, yellow, orange, brown and black. Rarely it may be blue. Both of these names refer to their use as gemstones, and each has

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