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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.
Examples of intrusive rocks are granite and gabbro. Granite is made up of three common minerals - quartz, mica and feldspar - and when viewed from a distance appear tan, pinkish or gray, depending on the concentrations and grain sizes of the three minerals. This rock is very widely used as a building material, due to its abundance and strength. Gabbro has a lower quartz content than granite, and is therefore much darker. Liquid rock that reaches the surface cools very quickly. As a result of this immediate cooling, the crystals produced are extremely small.