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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.
Characteristics of rocks. Some rocks are harder than others. For example, granite is a very hard rock, but chalk is a very soft rock and wears away easily. Some rocks, such as sandstone or chalk, let water soak through them.They are called permeable rocks.haracteristics of rocks. Some rocks are harder than others. For example, granite is a very hard rock, but chalk is a very soft rock and wears away easily. Some rocks, such as sandstone or chalk, let water soak through them. They are called permeable rocks.