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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.
Moreover, perspective areas in Chenlibel agate chalcedony deposit and Dozular limestone deposit in Goygol region have been marked out.
The Native American displays, for example, span from chalcedony blade tips carved in New Mexico about 10,500 years ago to 19th-century lacrosse sticks, and recent photographs documenting Midwestern burial mounds partly subsumed under golf courses.
At the base of the writing instrument, a chalcedony evokes the magnificent colour of a real east Asian Azure Dragon.
The gold bearing veins at Paciencia are associated with adularia, chalcedony, sulfosalts and crustiform-colloform textures typical of low sulfidation gold-silver bearing systems that are found elsewhere in northern Chile.
The term intaglio describes a design incised or engraved into the surface of a material, in this case hardstones such as carnelian, agate, jasper and chalcedony.
Included also are a couple of one-off high jewelry pieces, a necklace of uniquely cut chalcedony with diamonds and rubies, and a two-headed Serpenti watch of pink gold and diamonds.
For lithic raw materials, most of the stone implements are made of flint, which is a chemically precipitated sedimentary silica rock consisting mostly of length-fast (LF) chalcedony.
He has gambled away chalcedony and jade for more feathers.
A few of the dykes look to contain amygdules comprising abundant calcite, and small amounts of chlorite, amphibole, quartz, and chalcedony, locally in concentric arrangements.
For the new collection, trend setter Nguyen marries shades straight from the pallette of Pantone's Fall 2016 color report with a storyboard of classic gemstones, including lapis, aquamarine, turquoise, opal, moonstone and moss chalcedony.