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Quartzolite

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A rare coarse-grained crystalline igneous rock in which quartz comprises more than 90% of the felsic minerals, and has <90% mafic minerals. It usually includes some feldspars and micas and/or amphiboles, and grades into quartz-rich granitic rocks with increasing feldspars.

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


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Classification of QuartzoliteHide

Rocks in section 1a of the QAPF diagram.

Sub-divisions of QuartzoliteHide

Mineralogy of QuartzoliteHide

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:
AmphiboleAX2Z5((Si,Al,Ti)8O22)(OH,F,Cl,O)2
Feldspar > Alkali FeldsparFeldspar Group minerals rich in Potassium or Sodium.
Feldspar > PlagioclaseA petrological term for Albite-Anorthite Series.
MicaA petrological term for Mica Group.

References for QuartzoliteHide

Reference List:
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Le Maitre (ed.) (2002) Igneous Rocks - A Classification and Glossary of Terms. Cambridge Press

Internet Links for QuartzoliteHide

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