Which type of igneous rocks are described as dark colored and more dense?

Mafic igneous rocks are characterized by their darker coloration and greater density compared to other types of igneous rocks. This distinctiveness arises from their mineral composition, which is rich in magnesium and iron-bearing minerals, such as olivine and pyroxene. These minerals contribute to the darker hues, typically ranging from dark green to black.

In contrast, felsic igneous rocks are lighter in color and less dense, primarily composed of silica and aluminum-rich minerals such as quartz and feldspar. Intrusive igneous rocks form from magma that solidifies below the Earth's surface, which can include both mafic and felsic varieties, but does not specifically denote density or color. Extrusive igneous rocks, while they can also be mafic, encompass a wide range of colors and densities, depending on their composition and cooling history. Thus, the defining traits of mafic igneous rocks stand out as distinct in the context of this question.