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Quartz-rich-granitic-rock

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A rare coarse-grained crystalline igneous rock in which quartz comprises between 60-90% of the felsic minerals, and has <90% mafic minerals. It usually includes some feldspars and micas and/or amphiboles, and grades into quartzolite with increasing quartz, or granitoids with increasing feldspar.

In many cases these rocks may be hydrothermally altered granitoids (i.e greisens) rather than true igneous rocks.


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Classification of Quartz-rich-granitic-rockHide

Rocks in section 1b of the QAPF diagram.

Sub-divisions of Quartz-rich-granitic-rockHide

Mineralogy of Quartz-rich-granitic-rockHide

Essential minerals - these are minerals that are required within the classification of this rock:
Non-essential minerals - these minerals are common, sometimes major components, but are not always present:
Feldspar > Alkali FeldsparFeldspar Group minerals rich in Potassium or Sodium.
Feldspar > PlagioclaseA petrological term for Albite-Anorthite Series.

Internet Links for Quartz-rich-granitic-rockHide

Mineral and/or Locality  
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