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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.
There are also articles on physical rock formations, also known as strata, and the formal naming of geologic formations. The three main ways rocks are formed 1  : Sedimentary rocks are formed through the gradual accumulation of sediments: for example, sand on a beach or mud on a river bed.his article discusses how rocks are formed. There are also articles on physical rock formations, also known as strata, and the formal naming of geologic formations. The three main ways rocks are formed :