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Granite

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A granitoid (a coarse grained igneous rock composed mostly of quartz, Kspar (alkali-feldspar) and plagioclase). More specifically a rock having an alkali-feldspar/total feldspar ratio from 0.35-0.90 on the QAPF diagram and 20-60% quartz.


Classification of Granite

Granite is in section 3 of the QAPF diagram.

Sub-divisions of Granite

Mineralogy of Granite

Essential minerals - these are minerals that are required within the classification of this rock:
Feldspar > Alkali FeldsparFeldspar Group minerals rich in Potassium or Sodium.
Feldspar > PlagioclaseA petrological term for Albite-Anorthite Series.
Silica > QuartzSiO2
Non-essential minerals - these minerals are common, sometimes major components, but are not always present:
Amphibole > HornblendeAn informal name for dark green to black amphiboles, mostly ferro-hornblende or ...
Mica > BiotiteA series or subgroup of the Mica Group.
Mica > MuscoviteKAl2(AlSi3O10)(OH)2

Internet Links for Granite

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