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[kal-sed-n-ee, kal-suh-doh-nee] /kælˈsɛd n i, ˈkæl səˌdoʊ ni/
noun, plural chalcedonies.
a microcrystalline, translucent variety of quartz, often milky or grayish.
Origin of chalcedony
1275-1325; Middle English calcedonie < Late Latin chalcēdōnius (Vulgate, Rev. XIX, 19), equivalent to chalcēdōn- (< Greek chalkēdṓn chalcedony, identified by Saint Jerome with Chalcedon, the city) + -ius -ious
Related forms
[kal-si-don-ik] /ˌkæl sɪˈdɒn ɪk/ (Show IPA),
chalcedonous, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2017.
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British Dictionary definitions for chalcedony


noun (pl) -nies
a microcrystalline often greyish form of quartz with crystals arranged in parallel fibres: a gemstone. Formula: SiO2
Derived Forms
chalcedonic (ˌkælsɪˈdɒnɪk) adjective
Word Origin
C15: from Late Latin chalcēdōnius, from Greek khalkēdōn a precious stone (Revelation 21:19), perhaps named after Khalkēdōn Chalcedon, town in Asia Minor
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for chalcedony

c.1300, from Latin calcedonius, in Vulgate translating Greek khalkedon in Rev. xxi:19, found nowhere else. Connection with Chalcedon in Asia Minor "is very doubtful" [OED]. The city name is from Phoenician and means "new town."

Online Etymology Dictionary, © 2010 Douglas Harper
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chalcedony in Science
A type of quartz that has a waxy luster and varies from transparent to translucent. It is usually white, pale-blue, gray, brown, or black and is often found as a lining in cavities. Agate, flint, and onyx are forms of chalcedony. Chemical formula: SiO2.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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chalcedony in the Bible

Mentioned only in Rev. 21:19, as one of the precious stones in the foundation of the New Jerusalem. The name of this stone is derived from Chalcedon, where it is said to have been first discovered. In modern mineralogy this is the name of an agate-like quartz of a bluish colour. Pliny so names the Indian ruby. The mineral intended in Revelation is probably the Hebrew _nophekh_, translated "emerald" (Ex. 28:18; 39:11; Ezek. 27:16; 28:13). It is rendered "anthrax" in the LXX., and "carbunculus" in the Vulgate. (See CARBUNCLE.)

Easton's 1897 Bible Dictionary
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