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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.
intermediate rock An igneous rock with a chemical composition between those of basic and acid rocks.The limits are not fixed rigidly. Cite this article. Pick a style below, and copy the text for your bibliography.MLA. Chicago. APA. MICHAEL ALLABY.  intermediate rock. . . 2004.ntermediate rock Igneous rock whose chemical composition lies between those of basic and acidic rocks, e.g. andesite. The limits are not fixed rigidly and a number of schemes exist that are based on modal mineralogy and the whole rock chemistry (see MODAL ANALYSIS). Compare ACID ROCK; and BASIC ROCK.