sardonyx

sardonyx

a variety of chalcedony with alternating reddish-brown and white parallel bands, used as a gemstone. Formula: SiO2
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005

sardonyx

[sär′dän·iks]
(mineralogy)
An onyx characterized by parallel layers of sard, a deep orange-red variety of chalcedony, and a mineral of different color.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.

sardonyx

August. [Am. Gem Symbolism: Kunz, 319–320]
See: Birthstones
Allusions—Cultural, Literary, Biblical, and Historical: A Thematic Dictionary. Copyright 2008 The Gale Group, Inc. All rights reserved.
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