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also cal·ced·o·ny (kăl-sĕd′n-ē)
n. pl. chal·ced·o·nies also cal·ced·o·nies
A translucent to transparent milky or grayish quartz with distinctive microscopic crystals arranged in slender fibers in parallel bands.

[Late Latin chalcēdonius, from Greek khalkēdōn, a mystical stone (Revelation 21:19), perhaps from Khalkēdōn, Chalcedon.]

chal′ce·don′ic (kăl′sĭ-dŏn′ĭk) adj.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.


(kælˈsɛdənɪ) or


n, pl -nies
(Minerals) a microcrystalline often greyish form of quartz with crystals arranged in parallel fibres: a gemstone. Formula: SiO2
[C15: from Late Latin chalcēdōnius, from Greek khalkēdōn a precious stone (Revelation 21:19), perhaps named after Khalkēdōn Chalcedon, town in Asia Minor]
chalcedonic adj
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014


(kælˈsɛd n i, ˈkæl sɪˌdoʊ ni)

n., pl. -nies.
a microcrystalline translucent variety of quartz, often milky or grayish.
[1275–1325; Middle English calcedonie < Late Latin chalcēdōnius < Greek chalkēdṓn, identified by St. Jerome with Chalcedon]
chal`ce•don′ic (-sɪˈdɒn ɪk) adj.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.


A type of quartz that has a waxy luster and varies from transparent to translucent. It is used as a gemstone. Agate and onyx are forms of chalcedony.
The American Heritage® Student Science Dictionary, Second Edition. Copyright © 2014 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.chalcedony - a milky or greyish translucent to transparent quartz
quartz - a hard glossy mineral consisting of silicon dioxide in crystal form; present in most rocks (especially sandstone and granite); yellow sand is quartz with iron oxide impurities
agate - an impure form of quartz consisting of banded chalcedony; used as a gemstone and for making mortars and pestles
bloodstone, heliotrope - green chalcedony with red spots that resemble blood
carnelian, cornelian - a translucent red or orange variety of chalcedony
chrysoprase - a green variety of chalcedony valued as a gemstone
onyx - a chalcedony with alternating black and white bands; used in making cameos
plasma - a green slightly translucent variety of chalcedony used as a gemstone
sard, sardius, sardine - a deep orange-red variety of chalcedony
transparent gem - a gemstone having the property of transmitting light without serious diffusion
Based on WordNet 3.0, Farlex clipart collection. © 2003-2012 Princeton University, Farlex Inc.


[kælˈsɛdənɪ] ncalcedonio
Collins Italian Dictionary 1st Edition © HarperCollins Publishers 1995
References in classic literature ?
"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."
This three-year-old returned from a four-month break to finish second to Chalcedony over this course and distance three weeks ago.
The museum was divided into several sections: (1) corals, (2) clays and earths, (3) crystal-lined geodes, amethyst, fluorite, diamond, opal, cat's-eye, emerald, topaz, malachite, jasper, beryl, sapphire, lapis lazuli, turquoise, ruby, garnet, chalcedony, sardonyx, carnelian, agate, magnetite, hematite, dolomite, gypsum and some fossils and other materials, (4) gold, silver, cinnabar, copper and iron minerals, antimony minerals, coal, talc, alum, cassiterite and others, (5) the herbarium, and (6) stuffed animals and dried or preserved animal parts, including the purported horn of a unicorn (actually a narwhal's tooth).
Chalcedony impressed with his attitude in the 10-furlong three-year-old handicap-he really was most tenacious in responding to vigorous riding from half a mile out and can win again this winter.
Stuart gave the American Museum a mesosiderite meteorite from Vaca Muerta, Chile, which fell before 1861; a Brazilian chalcedony enhydro in 1884; and in 1886 she gave a Japanese stiboite that she had purchased from Charles Herrmann and a specimen of gold crystals on quartz from Eldorado County, California.
David Barron, one of the leading players on the all-weather since its inception, reeled off a 264-1 treble with Krystal Max, Venika Vitesse and Chalcedony at Lingfield yesterday, writes Tony Coleman.
Barron also has a very good chance with Chalcedony in the Nelson Handicap (3.45).
Veins range from less than 1 m to over 30 m in thickness and consist of quartz, chalcedony, calcite and pyrite, often showing banded, colloform, crustiform, vuggy and/or brecciated textures.
Silver, jade, chalcedony, enameling jewelry are the main types of products you can find on Light Stone's website.
It has 2937 thousand cubic meters of tuff resources in Tulus area, 5434 thousand cubic meters of building sand in Chaxmagchay and Soltanli fields, 296 thousand cubic meters of brick clay resources in Garacalli, 6644 thousand tons of volcanic ash used in cement production, as well as large limestone, chalcedony and sand fields.
The top lot was an unusually large (3.4cm long) Roman black chalcedony intaglio portrait of Antinous which has been hailed as the finest surviving portrait, in any medium, of the Emperor Hadrian's beautiful young favourite (Fig.
WHAT mineral, combined with moganite, forms chalcedony? WHERE is the tomb of Mohammed?