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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.
igneous rock containing 56â65 percent silica. This category includes primarily feldspathic rocks with small admixtures of such ferromagnesian minerals as pyroxene, hornblende, and, more rarely, biotite. Intermediate plagioclases (oligoclase, andesine) are typical of feldspars.According to the weight percentage of the constituents of intermediate rocks, a distinction is made between the sodium series (diorites, andesites, andÃ©sites) porphyrites and the calcic (series, syenites). trachytesntermediate rocks are found mainly among extrusive rocks in which andesites andÃ©sites and porphyrites predominate over trachytes and; porphyries the intrusive (rocks, diorite) syenite are much less widely. distributed