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Quartz diorite is an Igneous rock, plutonic (Intrusive rock) rock, of felsic composition, with Phanerite texture. Feldspar is present as plagioclase (typically oligoclase or andesine) with 10% or less potassium feldspar. Quartz is present at between 5 and 20% of the rock. Biotite, and are common dark accessory minerals.
Quartz diorite occurs in association with other granitic rocks such as granodiorite, and with volcanic rock. In western North America a "quartz diorite line" occurs; west of this line, the dominant granitic rock is quartz diorite.
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