Mafic rocks are igneous rocks that are rich in dark-colored minerals such as pyroxene, amphibole, and biotite. They are typically dark in color, and have a high density and specific gravity. Mafic rocks are formed by the crystallization of magma that is high in iron and magnesium.

Some examples of mafic rocks include:

* Basalt

* Gabbro

* Peridotite

* Norite

* Dolerite

Mafic rocks are often found in oceanic crust and in the Earth's mantle. They are also found in some continental crustal rocks, such as in the cores of mountain belts.

Mafic rocks are important because they provide information about the composition and evolution of the Earth's crust and mantle. They are also used as building materials and in the production of cement and asphalt.