Dark igneous rock is a type of rock formed from molten magma that has cooled and solidified. It is usually black or dark gray in color and is composed of minerals such as feldspar, pyroxene, and olivine. Common examples of dark igneous rocks include TRAP, BASALT, diabase, and dolerite. TRAP is an extrusive igneous rock with a fine-grained texture, while BASALT is a mafic extrusive igneous rock with a fine-grained texture. Diabase is an intrusive igneous rock with a medium-grained texture, and dolerite is an intrusive igneous rock with a coarse-grained texture. All of these rocks are dark in color and are composed of minerals such as feldspar, pyroxene, and olivine.