Question: what is the difference between the composition of felsic and mafic igneous rocks?
Answer: Originally Answered: What is the difference between mafic and felsic? Mafic minerals or rocks are dark colored and contain a lot of iron and magnesium (e.g. hornblende, augite, olivine). Felsic minerals or rocks tend to be light colored and don't contain much iron and manganese (e.g. mostly feldspars and quartz).