Other Definitions
onyx (dict)
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Onyx - This article is about the mineral. See Onyx (disambiguation) for other meanings
Onyx is a banded variety of chalcedony, a cryptocrystalline form of quartz. The colours of its bands are white and black. It is usually cut as a cabochon, or into beads, and is also used for intaglios and cameos. Some onyx is natural but much is produced by the staining of agate. See also
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