"Mafic" refers to a category of igneous rocks and minerals that are rich in magnesium and iron. These rocks typically have a darker color and a higher density compared to their felsic counterparts, which are richer in silica. Common examples of mafic rocks include basalt and gabbro. Mafic minerals, such as olivine and pyroxene, are often found in these rocks and contribute to their properties. Mafic compositions are commonly associated with volcanic activity, particularly at mid-ocean ridges and hotspots, where magma is generated from the Earth's mantle.