* Composition: The mantle is composed of peridotite, a rock rich in magnesium (Mg) and iron (Fe). These elements are characteristic of mafic minerals like olivine and pyroxene.

* Melting Point: Mafic magma has a higher melting point than felsic magma. The pressure and temperature conditions within the mantle are generally conducive to the formation of mafic magma.

* Density: Mafic magma is denser than felsic magma. This density difference plays a role in magma movement and eruption processes.

Felsic magma is less common in the mantle and is more likely to be found in the Earth's crust. It's formed by the melting of pre-existing crustal rocks, which are richer in silica (SiO2) and other lighter elements.

In summary: While the mantle can contain some felsic material, its primary magma composition is mafic due to the rock composition and the prevailing conditions of pressure and temperature.