Mafic Andesite Diorite Intermediate Rhyolite Granite Felsic Ultramafic rocks are almost entirely ferro-magnesian minerals. Ultramafic extrusive rocks are very rare and most ultramafic rocks are the residue of partial melting. Mafic rocks contain roughly equal amounts of ferro-magnesian minerals and calcic feldspar. Felsic rocks contain minor ferromagnesian minerals, abundant quartz and both Na and K feldspars. Igneous rock compositions change as the result of partial melting and fractional crystallization .
Mafic magmas are typically hotter than felsic magmas.
Igneous bodies commonly have fine grained chilled margins and coarser-grained interiors.