chalcedony - Hutchinson encyclopedia article about chalcedony Printer Friendly
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chalcedony

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chalcedony

Form of the mineral quartz, SiO2, in which the crystals are so fine-grained that they are impossible to distinguish with a microscope (cryptocrystalline). Agate, onyx, and carnelian are gem varieties of chalcedony.



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When we are apart I always imagine your face as a face of gold, with eyes and teeth of bdellium, or chalcedony, or agate, or any wonderful unknown stones of appropriate colors.
 
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