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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.
Accessory minerals in andesite include quartz, hornblende, pyroxene, glass, garnet and ilmenite. Andesite can also contain orthoclase. It's considered an intermediate rock, which means it has between 52 and 63 percent silicon dioxide. Andesite is a fine-grained, igneous rock that's formed out of lava flows. It's usually a blackish-brown or green color, especially if the rock contains a lot of glass. It is often found with basalt and sourced from the Pacific Ocean. It's also part of the crust of the planet Mars.