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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.
Gneiss appears to be striped in bands, called gneissic banding. The banding is developed under high temperature and pressure conditions. The minerals are arranged into layers that appear as bands in cross section.The appearance of layers, called compositional banding, occurs because the layers, or bands, are of different composition.neissic rocks are usually medium-to coarse-foliated; they are largely recrystallized but do not carry large quantities of micas, chlorite or other platy minerals. Gneisses that are metamorphosed igneous rocks or their equivalent are termed granite gneisses, diorite gneisses, etc.