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Granodiorite

A rock classification type
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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.


Unique IdentifiersHide

Mindat ID:
48163
Long-form identifier:
mindat:1:1:48163:6
GUID
(UUID V4):
4253ed19-9fd7-4f12-89f4-e5a47439fd10

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 FeldsparA subgroup of the Feldspar Group, poor in calcium, and mostly rich in potassium.
Feldspar > Plagioclase(Na,Ca)[(Si,Al)AlSi2]O8
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]

Pronunciation of GranodioriteHide

Pronunciation:
PlayRecorded byCountry
Jolyon RalphUnited Kingdom

Common AssociatesHide

Associated Minerals Based on Photo Data:
3 photos of Granodiorite associated with AzuriteCu3(CO3)2(OH)2
2 photos of Granodiorite associated with TitaniteCaTi(SiO4)O
1 photo of Granodiorite associated with MicroclineK(AlSi3O8)
1 photo of Granodiorite associated with Aplite
1 photo of Granodiorite associated with CerussitePbCO3
1 photo of Granodiorite associated with SphaleriteZnS
1 photo of Granodiorite associated with Orbiculite
1 photo of Granodiorite associated with Skarn
1 photo of Granodiorite associated with Marble
1 photo of Granodiorite associated with QuartzSiO2

Internet Links for GranodioriteHide

References for GranodioriteHide

Reference List:
 
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