Igneous RocksScripps Classroom Connection Mafic Mafic magma or igneous rock rich in magnesium (Mg) and iron (Fe) and generally dark Felsic Felsic - magma or igneous rock rich in feldspars and silica and generally light Partial Melting process by which different minerals in rock melt at different temperatures Fractional Crystallization reversed process of partial meltingScripps Classroom Connection Partial Melting Bowens Reaction SeriesScripps Classroom Connection Intermediate Igneous Rocks Felsic Igneous Rocks Mafic Igneous RocksScripps Classroom Connection Extrusive an igneous rock formed at the Earths surface Intrusive an igneous rock formed beneath Earths surfaceScripps Classroom Connection Scripps Classroom Connection How to classify igneous rocks: Scripps Classroom ConnectionFelsicIntermediateMaficUltramafic Coarse GraniteDioriteGabbroPeridotite Fine RhyoliteAndesiteBasalt Vesicular PumiceScoria Glassy Obsidian* Light Dark Rock Color Scripps Classroom Connection How are the different textures of igneous rocks formed? Animations Scripps Classroom Connection Scripps Classroom Connection Relation of Igneous Rocks to Plate Tectonic Boundaries Animations Mid-ocean RidgesScripps Classroom Connection Overview Igneous rock formation Crystal size and other textures Color Igneous rock classification Locations where igneous rocks formScripps Classroom Connection