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lamprophyre

[lam-pruh-fahyuh r]
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noun Petrology.
  1. any dark intrusive rock in which dark minerals occur both as phenocrysts and as groundmass.
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Origin of lamprophyre

1885–90; lampro- (< Greek lamprós clear) + -phyre
Related formslam·pro·phyr·ic [lam-pruh-fir-ik] /ˌlæm prəˈfɪr ɪk/, adjective
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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British Dictionary definitions for lamprophyre

lamprophyre

noun
  1. any of a group of basic igneous rocks consisting of feldspathoids and ferromagnesian minerals, esp biotite: occurring as dykes and minor intrusions
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Word Origin

C19: from Greek lampros bright + -phyre, from porphyry
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

lamprophyre in Science

lamprophyre

[lămprə-fīr′]
  1. A dark igneous rock, having a porphyritic texture in which both the phenocrysts (larger crystals) and the matrix consist primarily of pyroxene, hornblende, and biotite.
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The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.