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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.
Andesite - an intermediate volcanic rock. Alkali feldspar granite - a granitoid in which at least 90% of the total feldspar is in the form of alkali feldspar. Anorthosite - a mafic intrusive igneous rock composed predominantly of plagioclase.