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Quartz diorite

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 to 20% of the rock. Biotite, amphiboles and pyroxenes are common dark accessory minerals.


  • Williams, Howel; Francis J. Turner and Charles M. Gilbert (1954) Petrography, W. H. Freeman
  • Definition with images
This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Quartz_diorite". A list of authors is available in Wikipedia.
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