limburgite

limburgite

▪ rock
      dark-coloured volcanic rock that resembles basalt but normally contains no feldspar. It is associated principally with nepheline-basalts and leucite-basalts; it also occurs with monchiquite, from which it is not easily distinguished. Limburgite may occur as flows, sills, or dikes and sometimes contains many cavities.

      Limburgite consists essentially of olivine and augite with a brown, glassy groundmass in which a second generation of small augite crystals is commonly found. The principal accessory minerals are titaniferous iron oxides and apatite; in some limburgites, hornblende and biotite are found as large scattered crystals, in others orthoclase or anorthoclase. Rocks of this group are found in considerable quantities, as in the Rhine district of Germany; Bohemia, Czech Republic; Haddington, East Lothian, Scotland; the Auvergne region, France; Spain; Kilimanjaro, Africa; and Brazil.

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Universalium. 2010.

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Look at other dictionaries:

  • limburgite — /limˈbər gīt/ noun A volcanic rock composed of olivine and augite, etc, in a fine grained or glassy groundmass ORIGIN: Limburg in Baden, a typical locality …   Useful english dictionary

  • Limburgite — In petrology, limburgite is a dark colored volcanic rock resembling basalt in appearance, but containing normally no felspar. The name is taken from Limburg, Germany, where they occur in the well known rock of the Kaiserstuhl. They consist… …   Wikipedia

  • Limburgit — Limburgit, Magmabasalt, feldspatfreie, vorwiegend aus Augit und Olivin bestehende, basaltähnliche, porphyrische oder dichte Gesteine der Tertiär und Jetztzeit. Sie führen außer den Hauptgemengteilen noch eine sie teigartig umschließende oft… …   Lexikon der gesamten Technik

  • Basalte — Basalte, vulkanische Gesteine der Tertiär , Diluvial und Alluvialperiode, im wesentlichen aus einem Feldspat oder feldspatähnlichen Mineral (Leucit oder Nephelin), Augit und Magneteisen (oder Titaneisen) bestehend und vielfach Olivin führend.… …   Meyers Großes Konversations-Lexikon

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