Silicic rock - Crystals >3mm - Granite, Mafic rock - Crystals >3mm - Gabbro, Mafic rock - Crystals 1-3mm - Dolerite, Mafic rock - Crystals <1mm - Basalt, Ultramafic rock  - Peridotite, Silicic silica % - >66%, Mafic silica % - 45-52%, Ultramafic silica % - <45%, Intermediate silica % - 52-66%, Common minerals in silicic rocks - Quartz, K-Feldspar, Plagioclase Feldspar, Biotite, Muscovite, Common minerals in intermediate rocks - K-Feldspar, Plagioclase Feldspar, Biotite, Hornblende, Common minerals in mafic rocks - Plagioclase feldspar, Augite, Olivine, Common minerals in ultramafic rocks - Augite, Olivine,

Igneous classification

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