is a group name of dike rocks. Their composition can vary and they are often altered.
Dark-colored, medium-grained intrusive igneous rock occurring as dikes; composed of biotite, hornblende, pyroxene, and feldspars or feldspathoids.
An igneous rock, composed of dark minerals, that occurs in the form of dykes.
A group name applied to dark dyke rocks in which dark minerals occur; sometimes contain diamonds.
hypabyssal eruptive rock. Two types are encountered in Morvan region, minette with abundant biotite and vogesite with augite or hornblende.
Lamprophyres (Greek Lampros, "bright", and the terminal part of the word "porphyry", meaning "rocks containing bright porphyritic crystals")