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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.
Let's review. Igneous rocks are rocks made from the cooling and solidifying of molten rock. There are two categories of igneous rocks. Volcanic rocks are rocks formed when lava cools and solidifies on the earth's surface.Volcanic rocks are also known as 'extrusive igneous rocks' because they form from the 'extrusion,' or eruption, of lava from a volcano.he term 'igneous' comes from the Latin language and is the word for 'fire,' which is a very appropriate name due to the fact that igneous rocks originate from fiery, red-hot magma. We associate magma with volcanoes, yet you don't actually see magma because by definition, magma is located below the surface of the earth.