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Keywords: Mineralogy igneous rocks EN.svg Mineralogical composition of igneous rocks with decreasing silica SiO<sub>2</sub> content The rock names for volcanic/extrusive and plutonic/intrusive rocks are written above Notice that this is a rough way to determine a rock name the exact difference between the given igneous rocks does not only depend on silica content Own 2009-03 Woudloper Petrology diagrams Igneous rocks |