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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.
Rocks with visible crystals of roughly the same size are said to have a phaneritic texture. A body of intrusive igneous rock that crystallizes from cooling magmas beneath the Earth's surface is called a pluton. If the pluton is large, it may be called a batholith or a stock. Minor plutons include dikes and sills. If a penetrating intrusion cuts across the geological layers it is called a dike. If it runs parallel to the layers, it is called a sill. If an intrusion causes the rocks above to rise and form a dome, it is called a laccolith.