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Encyclopedia Britannica - Main :: LEO-LOB |
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LIMBURGITE , in petrology, a dark-coloured volcanic rock
appearance , but containing normally no felspar. The name is taken from Limburg (Germany), where they occur in the well-known rock
pale green or colourless, but is sometimes yellow (hyalosiderite). In the ground mass a second generation of small eumorphic augites frequently occurs; more rarely olivine is present also as an ingredient of the matrix. The principal accessory minerals are titaniferous iron oxides and apatite. Felspar though sometimes present is never abundant, and nepheline also is unusual. In some limburgites large phenocysts of dark brown hornblende and biotite are found, mostly with irregular borders blackened by resorption; in others there are large crystals of soda orthoclase or anorthoclase. Hauyne is an ingredient of some of the limburgites of the Cape Verde Islands. Rocks of this group occur in considerable numbers in Germany (Rhine district
Scotland , Auvergne, Spain, Africa (Kilimanjaro
bear a very close resemblance in structure and in mineral
Canary
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