In petrology, limburgite is a dark-colored volcanic rock resembling basalt in appearance, but containing normally no feldspar. The name derives from the type locality the Limberg or the Limburg, close to Sasbach am Kaiserstuhl in Baden-Württemberg, where they occur in the well-known rock of the Kaiserstuhl. They consist essentially of olivine and...
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http://en.wikipedia.org/wiki/Limburgite
dark-coloured volcanic rock that resembles basalt but normally contains no feldspar. It is associated principally with nepheline-basalts and ...
Found on
http://www.britannica.com/eb/a-z/l/51
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