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Middle English sardonix probably from Latin sardonyx from Greek sardonux sardion sard sard onux onyx, nail nogh- in Indo-European roots
American Heritage Dictionary of the English Language, 5th Edition
See AGATE, BLOODSTONE, CARNELIAN, CHRYSOPRASE, HELIOTROPE, MOCHA STONE, ONYX, SARD and SARDONYX.
The ruby fuchsite and sardonyx are also unusual.
August - The August stone is peridot, with sardonyx listed as the August alternate.
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