lamprophyre definition by American Heritage Dictionary
The American Heritage® Dictionary of the English Language, 4th edition Copyright © 2010 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Any of several intermediate igneous rocks constituting feldspar and ferromagnesium minerals that occur as dikes and minor intrusions.
Origin: German Lamprophyr : Greek lampros, clear (from lampein, to shine) + French porphyre, porphyry (from Old French porfire; see porphyry).
lamprophyre - Science Definition
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.