Quartz diorite
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.
References
- Williams, Howel; Francis J. Turner and Charles M. Gilbert (1954) Petrography, W. H. Freeman
- Definition with images
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