In this geosite we can observe a rock from the Earth`s mantle. It is called by Dunite and is a rock of the peridotite group consisting essentially of dark minerals. This minerals are rich in magnesium and iron, such as olivines, pyroxenes ad amphiboles, and may also contain chromite The peridotites create soils with high levels of nickel, iron and chromium that induce the growth and reproduction of the flora in this region. The toxicity of these soils makes farming impossible, so Morais Massif is also known as Cursed Hill.