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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 kinds of metamorphic rocks found around intrusions are called 'contact metamorphic rocks' because they have formed due to contact with the heat from the intruded igneous rocks. Regionally metamorphosed rocks may form due to the increased pressure and depth of burial of large volumes of rocks in tectonic compressional zones, which can be thrust belts, or subduction zones.