Granodiorite
A rock classification type
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About Granodiorite
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 Identifiers
Mindat ID:
48163
Long-form identifier:
mindat:1:1:48163:6
GUID
(UUID V4):
(UUID V4):
4253ed19-9fd7-4f12-89f4-e5a47439fd10
Classification of Granodiorite
Granodiorite is in section 4 of the QAPF diagram.
Sub-divisions of Granodiorite
Mineralogy of Granodiorite
Essential minerals - these are minerals that are required within the classification of this rock:
| Feldspar > Alkali Feldspar | A subgroup of the Feldspar Group, poor in calcium, and mostly rich in potassium. |
| Feldspar > Plagioclase | (Na,Ca)[(Si,Al)AlSi2]O8 |
| Silica > Quartz | SiO2 |
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 Granodiorite
Pronunciation:
| Play | Recorded by | Country |
|---|---|---|
| Jolyon Ralph | United Kingdom |
Common Associates
Associated Minerals Based on Photo Data:
| 3 photos of Granodiorite associated with Azurite | Cu3(CO3)2(OH)2 |
| 2 photos of Granodiorite associated with Titanite | CaTi(SiO4)O |
| 1 photo of Granodiorite associated with Microcline | K(AlSi3O8) |
| 1 photo of Granodiorite associated with Aplite | |
| 1 photo of Granodiorite associated with Cerussite | PbCO3 |
| 1 photo of Granodiorite associated with Sphalerite | ZnS |
| 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 Quartz | SiO2 |
Internet Links for Granodiorite
mindat.org URL:
https://www.mindat.org/min-48163.html
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References for Granodiorite
Reference List:
Roses, Alt Empordà, Girona, Catalonia, Spain