Gabbro
A gabbroid composed of 10-90% Ca-dominant plagioclase and >5% clinopyroxene .
A group of basic intrusive igneous rocks composed principally of basic plagioclase (commonly labradorite or bytownite ) and clinopyroxene (augite ), with or without olivine and orthopyroxene ; also, any member of that group. It is the approximate coarse-grained/intrusive equivalent of basalt. Apatite , magnetite , and ilmenite are common accessory minerals. Commonly dark-colored.