chert

chert
   A hard, extremely dense or compact, dull to semivitreous, cryptocrystalline sedimentary rock, consisting dominantly of interlocking crystals of quartz less than about 30 mm in diameter; it may contain amorphous silica (opal). It sometimes contains impurities such as calcite, iron oxide, or the remains of siliceous and other organisms. It has a tough, splintery to conchoidal fracture and may be white or variously colored gray, green, blue, pink, red, yellow, brown, and black. Chert occurs principally as nodular or concretionary segregations in limestones and dolomites.
   GG

Glossary of landform and geologic terms. 2013.

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Look at other dictionaries:

  • Chert — Chert/Xert Chert Bandera …   Wikipedia Español

  • chert|y — «CHUR tee», adjective, chert|i|er, chert|i|est. full of chert; flinty …   Useful english dictionary

  • Chert — steht für: Chert (Castellón), eine Gemeinde in der Provinz Castellón, Spanien Chert (Gestein), eine Gruppe von Kieselgesteinen Diese Seite ist eine Begriffsklärung zur Unterscheidung mehrerer mit demselben Wort bezeichneter Begriffe …   Deutsch Wikipedia

  • Chert — (ch[ e]rt), n. [Ir. ceart stone, perh. akin to E. crag.] (Min.) An impure, massive, flintlike quartz or hornstone, of a dull color. [1913 Webster] …   The Collaborative International Dictionary of English

  • chert — ● chert nom masculin (mot anglais) Terme général désignant des roches sédimentaires siliceuses formées de calcédoine ou d opale (chailles, silex, jaspes, etc.) …   Encyclopédie Universelle

  • Chert —   [tʃəːt, englisch] der, s, Petrologie: Hornstein …   Universal-Lexikon

  • chert — flint like quartz, 1670s, of unknown origin …   Etymology dictionary

  • chert — [chʉrt] n. [< ?] an extremely dense type of quartz, including jasper and flint, having a dull, opaque luster and made up of microscopic crystals cherty [chʉrtē] adj. chertier, chertiest …   English World dictionary

  • Chert — For the Spanish municipality, see Xert. Chert Chert (  / …   Wikipedia

  • chert — noun a) Massive generally dull colored and usually opaque quartzite or hornstone or impure chalcedony or other flint like mineral. By general usage in mineralogy and geology, a chert does not have a conchoidal fracture. In North American… …   Wiktionary

  • Chert — Cette page d’homonymie répertorie les différents sujets et articles partageant un même nom. Le chert (ou chaille) est un silex. Chert est le nom castillan de la ville d Espagne Xert. Catégorie : Homonymie …   Wikipédia en Français

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