Home >  Term: lamprophyre
lamprophyre

A group of dark-colored, porphyritic, hypabyssal igneous rocks characterized by panidiomorphic texture, a high percentage of mafic minerals (esp. biotite, hornblende, and pyroxene), which form the phenocrysts, and a fine-grained groundmass with the same mafic minerals in addition to feldspars and/or feldspathoids; also, any rock in that group. Most lamprophyres are highly altered. They are commonly associated with carbonatites. Compare: leucophyre.

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Penulis

  • ed.young
  • (Milwaukee, United States)

  •  (V.I.P) 21084 poin
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