Quartz diorite from Dúbrava, Nízke Tatry Mountains, Slovakia

Quartz diorite is an igneous, plutonic (intrusive) rock, of felsic composition, with phaneritic 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, amphiboles and pyroxenes are common dark accessory minerals.[1]

Quartz diorite occurs in association with other granitic rock 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.[2]


  1. ^ Williams, Howel; Turner, Francis J; Gilbert, Charles M (1954). Petrography; an introduction to the study of rocks in thin sections, by Howel Williams, Francis J. Turner, and Charles M. Gilbert. San Francisco: W.H. Freeman. OCLC 976619418.
  2. ^ https://www.jstor.org/stable/30063866?read-now=1&seq=2#page_scan_tab_contents James G. Moore (1959). The Quartz Diorite Boundary Line in the Western United States.The Journal of Geology, Vol. 67, No. 2 (Mar., 1959), pp. 198–210