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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.
Geologists have broken up the Earthâs mantle into layered sections. The outermost layer is called the upper mantle, and goes down to a depth of 410 km. Below that is the the transition zone (660 km), then the lower mantle reaching a depth of 2,891 km.The various layers of the mantle have different types of rocks.Examples of rocks that you might find inside the mantle include: olivine, pyroxenes, spinel, and garnet.f you could take apart the rocks in the mantle, and separate them into their atomic elements, you would have 44.8% oxygen, 21.5% silicon, and 22.8% magnesium. Thereâs also iron, aluminum, calcium, sodium, and potassium. Of course, these elements are bound together into rocks. All of the rocks are various oxides.