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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 that are intermediate in composition between these two groups are also called (surprise!) the intermediate rocks. All of these minerals form through crystallization from silicate melts in the crust and mantle. Silicate Minerals