chalcedony(redirected from calcedonies)
chal·ced·o·nyalso 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.
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]
chal•ced•o•ny(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.
|Noun||1.||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
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
transparent gem - a gemstone having the property of transmitting light without serious diffusion