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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.


(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


(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.


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.
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


[kælˈsɛdənɪ] ncalcedonio
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.
Book Two in The Chalcedony Chronicles is a Fast-Paced Time Traveling Adventure
Contract notice: "work the water supply in the areas of competence of the second regional center of athens - galatsi and e ~regional center in ilion municipalities acharnon, metamorphosis, philadelphia - chalcedony, athens, galatsi, race and agioi anargyri - kamatero responsibility heraklion sector[beaucoup plus grand que]
But it is the colours that matter and in Venetian Colour (Yale: pounds 35) Paul Hills, who has lived in Venice for more than 20 years, examines Venetian Colour in terms of woven fabrics, master paintings and glass where he discusses sandwich glass, millefiori glass (think of a paperweight where a glass flower garden lies beneath the dome and you've got it), chalcedony glass with its mysterious swirls, similar to 1920s 'cloud glass' and latticino enamelled glass.
Barron completed a 271-1 treble when 3-1 favourite Chalcedony, ridden by Tim Sprake, beat Rolling Rio in the closing Nelson Handicap.
The new collection is a mixture of blackened silver, raw crystals, labradorite, black spinel, pearl chalcedony and pyrite.
In the female burials, there were bronze ear-rings, beads made of chalcedony, carnelian, gagate (jet), chalk, glass and glass with inlaid gold, together with bronze mirrors of different types and spindle whorls made of ceramic, talc and bronze.
Chalcedony, from David Barron's yard, looks interesting in the Pontefract Apprentice Series Handicap (2.
Bainbridge identifies a number of pieces as being his work, including a grey chalcedony donkey in the Royal Collection and a labradorite owl given by Queen Alexandra to her friend Lady De Grey, the Marchioness of Ripon.
The Tom George-trained six-year-old just found Chalcedony too good by a length and a half when trying to make all the running at Cheltenham three weeks ago.