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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 containing crystals are called geodes. (Refer to wikipedia). Also, many rocks, particularly igneous rocks and some sedimentary rocks are crystaline in nature. Granâ¦ite, for example, is typically made up of quartz, mica and feldspar. 8 people found this useful.