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Intrusive igneous rocks (also called plutonic rocks, named after Pluto, the Roman god of the underworld) are formed from magma that cools and hardens within the earth. Surrounded by pre-existing rock (called country rock), the magma cools slowly, and as a result these rocks are course grained.
Intrusive igneous rock is formed from solidified magma below the surface of the Earth. Intrusive rock exhibits a phaneritic texture, where the individual crystal grains are vi â¦ sible without magnification. Examples of intrusive igneous rocks are granite, diorite, and gabbro. Igneous rocks, which are formed from magma, are furtâ¦. 2  An Introduction to the Mineral Biotite Mica and its Role in Geology Biotite mica is a common rock-forming mineral. 3  It belongs to a large group of minerals that are found in igneous and metamorphic rocks.