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Best Answer: Intermediate rocks contain between 53% and 65% silica. They also contain potassium and plagioclase feldspar with a small amount of quartz.est Answer: Intermediate rocks contain between 53% and 65% silica. They also contain potassium and plagioclase feldspar with a small amount of quartz.
Intrusive igneous rocks are formed from magma that cools and solidifies within the crust of a planet, surrounded by pre-existing rock (called country rock); the magma cools slowly and, as a result, these rocks are coarse grained. The mineral grains in such rocks can generally be identified with the naked eye.he word igneous is derived from the Latin ignis, meaning of fire. Volcanic rocks are named after Vulcan, the Roman name for the god of fire. Intrusive rocks are also called plutonic rocks, named after Pluto, the Roman god of the underworld.