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Granodiorite

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About GranodioriteHide

A granitoid (a coarse grained igneous rock with <90% mafics, composed mostly of quartz, K-feldspar (alkali-feldspar) and plagioclase). It has 20-60% quartz and plagioclase is 65-90% of the total feldspar on the QAPF diagram. Coarse-grained plutonic rocks intermediate in composition between tonalite and granite containing quartz, plagioclase (oligoclase or andesine), and subordinate potassium feldspar, with biotite and/or hornblende, or, more rarely, pyroxene, as the mafic components; the approximate intrusive equivalent of rhyodacite.


Classification of GranodioriteHide

QAPF_P_4.png

Granodiorite is in section 4 of the QAPF diagram.

Sub-divisions of GranodioriteHide

Mineralogy of GranodioriteHide

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:
Feldspar > Plagioclase > Andesine(Na,Ca)[Al(Si,Al)Si2O8]
Feldspar > Plagioclase > Oligoclase(Na,Ca)[Al(Si,Al)Si2O8]

Pronounciation of GranodioriteHide

Pronounciation:
PlayRecorded byCountry
Jolyon & Katya RalphUnited Kingdom

Internet Links for GranodioriteHide

 
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