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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.
   Sedimentary rocks can also be formed when minerals are dissolved in  water and are then resolidified. This type of sedimentary rock is  called a chemical sedimentary rock. Oolitic limestone is a good  example of this type of sedimentary rock.1 person found this useful.gneous rocks are made from magma. Magma is made of melted rocks.  (When it is underground it is called magma, when it erupts on the  surface of the earth, it is called lava â¦ . It's the same material  though.) When magma/lava cools, it forms igneous rocks.