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Granite rock is classified according to the QAPF diagram for coarse grained plutonic rocks and is named by the percentage of quartz, alkali feldspar and plagioclase feldspar on the A-Q-P half of the diagram. True granite contains both plagioclase and alkali feldspars. When a granitoid is devoid or nearly devoid of plagioclase the rock is referred to as alkali granite. When a granitoid contains less than 10% orthoclase it is called tonalite. A granite containing both muscovite and biotite mica is called a binary or two-mica granite. Two-mica granites are typically high in potassium and low in plagioclase, and are usually S-type granites or A-type granites. The volcanic equivalent of plutonic granite is rhyolite. Granite has poor primary permeability.

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