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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.
Gabbro is normally found in the lower parts of oceanic crust and sometimes in relatively small intrusive features in continental crust. Andesite (see image link) and diorite are intermediate igneous rocks that have a chemistry between mafic and felsic (silica amounts between 53 to 65%).These rocks are composed predominantly of the minerals plagioclase feldspar, amphibole, and pyroxene.ndesite (see image link) and diorite are intermediate igneous rocks that have a chemistry between mafic and felsic (silica amounts between 53 to 65%). These rocks are composed predominantly of the minerals plagioclase feldspar, amphibole, and pyroxene.