Final answer:
A course-grained mafic igneous rock is an intrusive igneous rock composed mostly of feldspar and quartz, with minor hornblende and biotite. Examples include gabbro and granite.
Step-by-step explanation:
A course-grained mafic igneous rock is an intrusive igneous rock composed mostly of feldspar and quartz, with minor hornblende and biotite. It is formed from magma that cools slowly deep under the Earth's surface, resulting in the formation of large crystals.
One example of a coarse-grained mafic igneous rock is gabbro, which is often found in the oceanic crust. Gabbro is made up of predominantly dark-colored minerals and has a coarse texture.
Another example of a coarse-grained igneous rock is granite, which is composed of mainly light-colored minerals and has a sugary appearance due to its coarse-grained crystals.