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.
/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
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.

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