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Granite

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A granitoid (a coarse-grained igneous rock composed mostly of quartz, K-feldspar (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.
A coarse-grained, holocrystalline, felsic, acidic, plutonic rock.


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Classification of GraniteHide

Granite is in section 3 of the QAPF diagram.

Sub-divisions of GraniteHide

Mineralogy of GraniteHide

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

Age distributionHide

Recorded ages:
Mesoarchean to Paleogene : 3020 ± 50 Ma to 53.6 ± 0.8 Ma - based on 8 recorded ages.

References for GraniteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Chappel, B.W. and White, A.J.R. (1974) Two contrasting granite types. Pacific Geology: 8: 173-174.
Ishihara, S. (1977) The magnetite-series and ilmenite-series granitic rocks. Mining Geology: 27: 293-305.

Internet Links for GraniteHide

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