![]() In classifying intrusive igneous rocks, the first thing to consider is the percentage of ferromagnesian silicates. An important feature to note on this diagram is the red line separating the non-ferromagnesian silicates in the lower left (K-feldspar, quartz, and plagioclase feldspar) from the ferromagnesian silicates in the upper right (biotite, amphibole, pyroxene, and olivine). The diagram in Figure 3.4.1 can be used to help classify igneous rocks by their mineral composition. As has already been described, igneous rocks are classified into four categories: felsic, intermediate, mafic, and ultramafic, based on either their chemistry or their mineral composition.
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