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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 classify rocks in three groups, according to the major Earth processes that formed them. These are igneous, sedimentary, and metamorphic rocks. Sedimentary-Sedimentary rocks are formed on the surface of the Earth, either in water or on land.They are called secondary, because they often result from the accumulation of small pieces broken off from pre-existing rocks.ranite rocks are igneous rocks which were formed by slowly cooling pockets of magma that were trapped beneath the earth's surface. Obsidian rocks are igneous rocks that form when lava cools quickly above ground. Obsidian is actually glass and not a mixture of minerals.