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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.
Mafic rocks contain abundant dark-colored minerals (olivine, pyroxene, and plagioclase). They are compositionally rich in Fe, Mg, and Ca. A mafic rock known as basalt (R. Welleror of Cochise College, 2008). Intermediate rocks contain roughly equal amounts of dark-and light-colored miner als.exture refers to the size, shape and arrangement of crystal grains within a rock. Under the microscope, the mineral grains of igneous rocks tend to display an interlocking texture that represents the growth of minerals from a melt.