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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.
No. All rocks can become other rocks by the processes of erosion  and metamorphism.    An igneous rock may become eroded into its constituent mineral  grains such as â¦ quartz and feldspar, which are transported by wind  and water, eventually settling to form a sedimentary rock.hese crystals can be as large as a person to  microscopic in size. In fact, some igneous rocks have no crystals  at all and are called glass. What determines grain size is the  amount of time a rock has to cool before it solidifies.