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Quartz-rich-coarse-grained-crystalline-rock

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Quartz-rich (>60%) coarse-grained crystalline igneous rock. They usually include some feldspars and micas and/or amphiboles. It is subdivided into quartzolite (>90% quartz) and Quartz-rich granitic rock (60-90% quartz).

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-coarse-grained-crystalline-rockHide

QAPF_P_1,1a.png

Rocks in section 1 (including 1a) on the QAPF diagram.

Sub-divisions of Quartz-rich-coarse-grained-crystalline-rockHide

Mineralogy of Quartz-rich-coarse-grained-crystalline-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:
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.

Internet Links for Quartz-rich-coarse-grained-crystalline-rockHide

 
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