Geol. of or pertaining to igneous rocks that are rich in dark-colored minerals and that contain magnesium and iron and a comparatively low level of silica
Origin of maficma(gnesium) + Classical Latin f(errum), iron + -ic
Relating to or containing a group of dark-colored silicate minerals, composed chiefly of magnesium and iron, that occur in igneous rocks, including hornblende, pyroxene, olivine, and biotite.
Origin of maficma(gnesium) Latin f(errum) iron -ic
(comparative more mafic, superlative most mafic)
- A rock with such properties.