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Classification of plutonic rocks

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Plutonic rocks are classified primarily based on their mineral content (or mode). According to the International Union of Geological Sciences (IUGS), all rocks with a phaneritic, holocrystalline, and coarse-grained texture (> 3 mm) must be classified as plutonic rocks. The classification is centered on the QAPF diagram, developed by Streckeisen (1973).