Definition of chalcedony in English:


Pronunciation /kalˈsednē/ /kælˈsɛdni/ /CHalˈsednē/ /tʃælˈsɛdni/ /ˈkalsəˌdōnē/ /ˈkælsəˌdoʊni/ /ˈCHalsəˌdōnē/ /ˈtʃælsəˌdoʊni/

Translate chalcedony into Spanish


  • A microcrystalline type of quartz occurring in several different forms, including onyx, agate, and jasper.

    ‘Common cements include clay minerals such as kaolinite, montmorillonite, or illite; quartz or chalcedony; iron oxides such as haematite; or calcite.’
    • ‘Vein minerals are barite, calcite, chalcedony, and quartz.’
    • ‘The shoots and stalks themselves are casts composed of combinations of chalcedony, quartz, calcite, and barite.’
    • ‘Slowest-forming and most beautiful of all, huge crystals of amethyst, agate, chalcedony and rock crystal grow where condensed water has managed to seep into naturally insulated rock crevices.’
    • ‘Calcite and barite actually crystallize after the formation of chalcedony and quartz cease and often infill or possibly cause subsequent fracturing of the agate.’
    • ‘Other minerals mentioned from the mine by Dunham include galena, sphalerite, pyrite, chalcedony, and minor marcasite and pyrrhotite.’
    • ‘Furthermore Oehler had previously shown that the silica minerals quartz and chalcedony critically important in the petrification of wood, can be made, rapidly in the laboratory from silica gel.’
    • ‘The coarsely crystalline veins are composed predominantly of colorless barite and quartz and white chalcedony.’
    • ‘The depictions of birds and flowers were executed in precious materials including lapis lazuli, agate, Sicilian red and green jasper, chalcedony, amethyst and quartz as well as superb hard stones.’
    • ‘Groutite is observed as small, lustrous black, acicular crystals to 1/8 inch long that occur directly on the quartz or chalcedony.’
    • ‘The fine-grained sediment of the matrix is composed chiefly of microgranular quartz, although chalcedony with a fibrous texture is sometimes found.’
    • ‘The matrix is composed of microgranular quartz with some fibrous chalcedony.’
    • ‘The former habit is best known as the diagnostic morphology exhibited by stilbite; the latter is seen in many minerals, from malachite to chalcedony to goethite.’
    • ‘In fact, seventeen of the fifty-seven sites are specifically listed for agate, chalcedony, chert, jasper, or petrified wood.’
    • ‘Heaney expected to find that the quartz in tiger's-eye was chalcedony, a form that typically consists of fibrous, defect-riddled crystals less than 1 micrometer in diameter.’
    • ‘In the spring of 1968, Stepanov together with amateurs B. Kantor and E. Kurdyukov discovered the now-famous manifestation of hollow agates with chalcedony pseudostalactites in the Moscow region.’
    • ‘The collection today has eight vases executed by the Baroviers in calcedonio glass, which imitates chalcedony, banded agate, and other semiprecious stones.’
    • ‘Concretions of chalcedony after barite can be confused with cycads, and the wise collector must learn to differentiate between the two.’
    • ‘These include Neolithic tools made from chalcedony as well as nephrite objects from Ancient China.’
    • ‘The Brushy Basin sediments contain numerous chalcedony pseudomorph-after-barite concretions that range to more than 30 cm in diameter.’


Late Middle English from Latin calcedonius, chalcedonius (often believed to mean ‘stone of Chalcedon’, but this is doubtful), from Greek khalkēdōn.