What is granodiorite in geology ?

Granodiorite : definition

A granodiorite is a grainy plutonic rock intermediate between granite and quartz diorite, composed mainly of feldspar (dominant plagioclases compared to orthoclase), quartz (about 10%), with biotite, green hornblende and sometimes pyroxenes, as minerals accessories.
Streckeisen diagrams (or QAPF diagrams) - Classification of plutonic and volcanic rocks

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