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[lam-pruh-fahyuh r] /ˈlæm prəˌfaɪər/
noun, Petrology
any dark intrusive rock in which dark minerals occur both as phenocrysts and as groundmass.
Origin of lamprophyre
1885-90; lampro- (< Greek lamprós clear) + -phyre
Related forms
[lam-pruh-fir-ik] /ˌlæm prəˈfɪr ɪk/ (Show IPA),
adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the web for lamprophyre
  • Magnesium content in dolomitic rocks and lamprophyre dikes follows a similar pattern.
  • Bedrock is brecciated and fractured along contacts with lamprophyre dikes.
British Dictionary definitions for lamprophyre


any of a group of basic igneous rocks consisting of feldspathoids and ferromagnesian minerals, esp biotite: occurring as dykes and minor intrusions
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
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lamprophyre in Science
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.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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