lamprophyre

lam·pro·phyre  (lmpr-fr)

n.

Any of several intermediate igneous rocks constituting feldspar and ferromagnesium minerals that occur as dikes and minor intrusions.

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[German Lamprophyr : Greek lampros, clear (from lampein, to shine) + French porphyre, porphyry (from Old French porfire; see porphyry).]

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lamprophyre [ˈlæmprəˌfaɪə]

n

(Earth Sciences / Geological Science) any of a group of basic igneous rocks consisting of feldspathoids and ferromagnesian minerals, esp biotite: occurring as dykes and minor intrusions

[from Greek lampros bright + -phyre, from porphyry]

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lamprophyre  (lmpr-fr)

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.