Granodiorite

**Petrology:** Plagioclase, feldspar, quartz, muscovite (common mica), biotite and amphibole (hornblende) are rock-forming minerals associated with accessory minerals, e.g., magnetite, titanite and spinel. Contrary to granite, granodiorite appears darker as a result of the dominance of plagioclase and a higher proportion of dark minerals (biotite, hornblende).

**Genesis:** Granodiorite is white, light grey or black plutonic igneous rock, formed by an intrusion of silica-rich magma, which cools in large plutons, batholiths, massifs or stocks below the Earth's surface. It corresponds to the transition between granite and quartz diorite. Granodiorite shows granular, phaneritic and porphyritic texture and coarse-grained structure of such a holocrystalline rock. Granodiorite is most often used as crushed stone for road building, paving and as an ornamental stone. An intrusive igneous equivalent of the extrusive igneous is called ryodacite.

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