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lamprophyre

[lam-pruh-fahyuh r] /ˈlæm prəˌfaɪər/
noun, Petrology
1.
any dark intrusive rock in which dark minerals occur both as phenocrysts and as groundmass.
Origin
1885-1890
1885-90; lampro- (< Greek lamprós clear) + -phyre
Related forms
lamprophyric
[lam-pruh-fir-ik] /ˌlæm prəˈfɪr ɪk/ (Show IPA),
adjective
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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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

lamprophyre

/ˈlæmprəˌfaɪə/
noun
1.
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
lamprophyre
  (lām'prə-fīr')   
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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Encyclopedia Article for lamprophyre

any of a group of dark gray to black intrusive igneous rocks that generally occur as dikes (tabular bodies inserted in fissures). Such rocks are characterized by a porphyritic texture in which large crystals (phenocrysts) of dark, iron-magnesium (mafic) minerals are enclosed in a fine-grained to dense matrix (groundmass). The abundance, large size, well-formed crystal outline, and brilliantly reflecting cleavage faces of the mafic phenocrysts give the rock a striking appearance. Mafic minerals, including biotite, hornblende, augite, or olivine, not only constitute virtually all of the phenocrysts but occur in the groundmass as well, together with much potash feldspar, plagioclase, or feldspathoid.

Learn more about lamprophyre with a free trial on Britannica.com
Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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