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Chalcedony is a fine-grained member of the quartz family, similar in appearance to nephrite jade. It has no distinguishing characteristics, but it may be found in a wide variety of colors, among them the gemstone varieties known as jasper and agate. Two other ornamental varieties of chalcedony are carnelian, which has a deep reddish-brown color, and bloodstone, which is green with red flecks. Pale chalcedonies are often dyed, and usually appear unnatural.
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