![](http://www.alamy.com/thumbs/6/8112EE0B-30C9-422F-B057-9298E66C3E8B/2T448T0.jpg)
Tonalite or quartz diorite is an intrusive igneous rock. Sample.
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Photo credit: © José María Barres Manuel / Alamy / Afripics
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Keywords: close-, diorite, felsic, geology, horizontal, igneous, intrusive, petrology, phaneritic, plutonic, quartz, rock, sample, tonalite