[lam-pruh-fahyuh
r] 
| any dark intrusive rock in which dark minerals occur both as phenocrysts and as groundmass. |
[lam-pruh-fir-ik] , adjective | lamprophyre (lām'prə-fīr') Pronunciation Key
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. |