What is a tonalite in geology ?

Tonalite : definition

Tonalite is a grainy plutonic rock with quartz, plagioclase surrounded by a border of alkaline feldspar, hornblende and biotite.

It is the most common variety of quartz diorite, which forms small massifs associated with granitoids and diorite. another variety of quartz diorite, close to tonalite, is trondhjemite.
Streckeisen diagrams (or QAPF diagrams) - Classification of plutonic and volcanic rocks

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