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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.
The main composition types are mafic, which are lavas rich in iron and magnesium, while being low in silica; intermediate, which are lavas with medium amounts of iron, magnesium, and silica; and felsic, which are lavas that have the highest silica and lowest magnesium concentration.