Opal O"pal, n. [L. opalus: cf. Gr. ?, Skr. upala a rock, stone, precious stone: cf. F. opale.] (Min.) A mineral consisting, like quartz, of silica, but inferior to quartz in hardness and specific gravity. [1913 Webster]

Note: The {precious opal} presents a peculiar play of colors of delicate tints, and is highly esteemed as a gem. One kind, with a varied play of color in a reddish ground, is called the {harlequin opal}. The {fire opal} has colors like the red and yellow of flame. {Common opal} has a milky appearance. {Menilite} is a brown impure variety, occurring in concretions at Menilmontant, near Paris. Other varieties are {cacholong}, {girasol}, {hyalite}, and {geyserite}. [1913 Webster]

The Collaborative International Dictionary of English. 2000.

Look at other dictionaries:

  • Cacholong — Cach o*long, n. [F. cacholong, said to be from Cach, the name of a river in Bucharia + cholon, a Calmuck word for stone; or fr. a Calmuck word meaning beautiful stone ] (Min.) An opaque or milk white chalcedony, a variety of quartz; also, a… …   The Collaborative International Dictionary of English

  • Cacholong — also known as Kalmuck Agate is a form of common Opal although it is often mistaken for Agate or Chalcedony. A milky white colour with a Moh hardness of about 6, it is used for carving, cameos etc. Found in Austria, Czech Republic, Mongolia and… …   Wikipedia

  • Cacholong — Cacholong, Edelstein von milchweißer, auch röthlich weißer Farbe u. lebhaftem Glasglanz, specifisches Gewicht 2,224; besteht aus amorpher Kieselsäure. Breithaupt hängt den C. dem hydrophanen Opal (Amorphites hyalithus) an, Andere dem Chalcedon,… …   Pierer's Universal-Lexikon

  • Cacholong — (Kascholong), Mineral, s. Opal …   Meyers Großes Konversations-Lexikon

  • Cacholong — (Kascholong), s. Opal …   Lexikon der gesamten Technik

  • Cacholong — (spr. kasch ), s. Opal …   Kleines Konversations-Lexikon

  • cacholong — ● cacholong nom masculin (de Cach, nom propre, et kalmouk cholon, pierre) Variété d opale ayant l aspect blanc de la porcelaine …   Encyclopédie Universelle

  • cacholong — (ka cho lon) s. m. Terme de minéralogie. Chalcédoine d un blanc de lait. SUPPLÉMENT AU DICTIONNAIRE    CACHOLONG. Ajoutez : ÉTYM. •   Cach, fleuve voisin des Calmucks de Bukarie, et cholon, pierre dans la langue des Calmucks, BRONGNIART Minéral.… …   Dictionnaire de la Langue Française d'Émile Littré

  • cacholong — cach·o·long …   English syllables

  • cacholong — n. a kind of opal. Etymology: F f. Mongolian kashchilon beautiful stone …   Useful english dictionary

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