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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 and ultramafic magmas are high in dark, heavy minerals like pyroxene, amphibole, and olivine, which contribute to an igneous rock being dark in color with a higher speci â¦ fic gravity than felsic and intermediate magmas and rocks.gneous rocks that are dense and dark-colored are called basaltic  rocks. They are formed from magma that is rich in iron and  magnesium and poor in silica content. Edit. Share to: Paul Jones.